opensourcegames/entries/tocs/_all.md

All

• 0 A.D. (C, C++, GPL-2.0, beta)
• 1oom (C, GPL-2.0, mature)
• 2048 (JavaScript, MIT, mature)
• 2H4U (C++, GPL-2.0, mature, inactive since 2007)
• 2Moons Browsergame Engine (PHP, JavaScript, MIT, mature)
• 3D Pong (C, GPL-2.0, beta, inactive since 2004)
• 3d.city (JavaScript, GPL-3.0, mature, inactive since 2016)
• 3Dc (C, GPL-2.0, mature, inactive since 2000)
• 4D Maze Game (Java, Public domain, mature, inactive since 2008)
• 4D-TRIS (C, GPL-2.0, mature, inactive since 2012)
• 54321 (C++, Custom, mature, inactive since 2001)
• A Planet's Revenge (Python, GPL-3.0, beta, inactive since 2008)
• a2x (C, Python, C++, GPL-3.0, beta)
• A7Xpg (D, 2-clause BSD, beta, inactive since 2005)
• Abe's Amazing Adventure (C, GPL-2.0, mature, inactive since 2005)
• Abuse (C++, Lisp, Public domain, GPL-2.0, WTFPL, mature, inactive since 2011)
• Achtung, die Kurve! (JavaScript, AGPL-3.0, mature)
• ACM (C, GPL-2.0, mature, inactive since 2000)
• Adanaxis (C++, GPL-2.0, mature, inactive since 2007)
• AdaVenture (Ada, GPL-3.0, mature)
• Advanced Strategic Command (C++, GPL-2.0, mature)
• adventure engine (Lua, MIT, mature, inactive since 2013)
• Afternoon Stalker (C++, GPL-2.0, mature, inactive since 2012)
• AI Wars (Python, MIT, beta, inactive since 2010)
• Airstrike (C, GPL-2.0, beta, inactive since 2014)
• Aisleriot (C, Scheme, GPL-3.0, mature)
• Ajax3d (JavaScript, GPL-2.0, beta, inactive since 2007)
• Aklabeth (C, GPL-2.0, mature, inactive since 2004)
• Aleph One (C++, Lua, GPL-3.0, mature, inactive since 2015)
• Alex the Allegator 4 (C, GPL-2.0, mature, inactive since 2003)
• Alien Assault Traders (PHP, GPL-2.0, beta, inactive since 2009)
• Alimer (C++, MIT, beta)
• alive (C++, MIT, beta, inactive since 2017)
• Allegro (C, zlib, mature)
• Allure of the Stars (Haskell, AGPL-3.0, beta)
• Amphetamine (C, GPL-2.0, beta, inactive since 2008)
• Anagramarama (C, GPL-2.0, beta, inactive since 2002)
• Ancient Beast (JavaScript, AGPL-3.0, mature)
• Andor's Trail (Java, GPL-2.0, beta)
• android-chess (Java, C++, MIT, mature)
• Angband (C, GPL-2.0, mature)
• Angry Birds in Python (Python, MIT, mature, inactive since 2017)
• Annchienta (C++, GPL-3.0, mature, inactive since 2009)
• Annex: Conquer the World (MegaGlest Script, GPL-3.0, mature, inactive since 2014)
• Antares (C++, LGPL-3.0, beta)
• AntiChess (Java, MIT, mature, inactive since 2003)
• antiyoy (Java, GPL-3.0, beta)
• Anura (C, C++, zlib, mature)
• Apricots (C++, GPL-2.0, beta, inactive since 2003)
• aquastax (JavaScript, MIT, beta)
• Arashi-JS (JavaScript, GPL-2.0, beta, inactive since 2010)
• Arcane-Engine (C++, MIT, beta)
• Ardentryst (Python, GPL-3.0, mature, inactive since 2009)
• Argentum Online (Visual Basic, GPL-2.0, beta, inactive since 2014)
• Arianne / Marauroa (Java, GPL-2.0, mature)
• Armagetron Advanced (C++, GPL-2.0, mature)
• Armies (C++, GPL-3.0, mature, inactive since 2007)
• Armor Alley (JavaScript, CC-BY-NC, beta)
• Artillery Duel Reloaded (Python, GPL-3.0, beta, inactive since 2012)
• Arx Libertatis (C++, GPL-3.0, mature)
• asdf (JavaScript, MIT, mature)
• AssaultCube (C, C++, Custom, mature, inactive since 2018)
• AstroMenace (C++, C, GPL-3.0, mature)
• Athenaeum (Python, GPL-3.0, beta)
• ativayeban (C, C++, GPL-2.0, mature, inactive since 2015)
• Atlantis (C++, GPL-2.0, mature, inactive since 2016)
• Atomic Tanks (C++, GPL-2.0, mature, inactive since 2016)
• Atomiks (C, GPL-3.0, mature, inactive since 2015)
• Atomix (C, GPL-2.0, mature)
• Atrinik (C, Python, GPL-2.0, mature, inactive since 2016)
• Attal: Lords of doom (C++, GPL-2.0, mature, inactive since 2008)
• Aussenposten (JavaScript, MIT, beta, inactive since 2015)
• AutoREALM (C++, GPL-3.0, mature)
• Avanor (C++, Lua, GPL-2.0, beta, inactive since 2008)
• Azimuth (C, GPL-3.0, mature)
• Bacon2D (C++, MIT, beta, inactive since 2018)
• Balder2D (C++, GPL-2.0, beta, inactive since 2009)
• Ball and Paddle (C++, Scheme, GPL-3.0, beta, inactive since 2009)
• Ball And Wall (JavaScript, MIT, mature, inactive since 2015)
• Ballerburg SDL (C, GPL-3.0, mature)
• Barony (C++, GPL-3.0, mature)
• Bastet (C++, GPL-2.0, beta, inactive since 2018)
• Batalla Naval (C, GPL-2.0, mature, inactive since 2002)
• Batrachians (C++, GPL-2.0, beta, inactive since 2012)
• Battery (Java, EPL-2.0, Custom, mature, inactive since 2009)
• Battle City (C, C++, Pascal, GPL-3.0, mature, inactive since 2013)
• Battle Tanks (C++, GPL-2.0, mature, inactive since 2009)
• Battlefield Java (Java, GPL-3.0, beta, inactive since 2011)
• Battleround (Java, Apache-2.0, beta, inactive since 2015)
• Battles of Antargis (C, C++, GPL-2.0, beta, inactive since 2014)
• Beat Harvester (Python, GPL-2.0, beta, inactive since 2009)
• Berusky II (C++, GPL-3.0, beta, inactive since 2014)
• Berusky (C++, GPL-3.0, mature, inactive since 2013)
• Betrayer's Moon Tactics (JavaScript, GPL-2.0, beta, inactive since 2006)
• Between (PHP, C++, ?, beta, inactive since 2010)
• Billiards (Lua, Objective-C, GPL-3.0, beta, inactive since 2012)
• Biniax (C, zlib, mature, inactive since 2012)
• Biogenesis (Java, GPL-2.0, beta)
• Birth of the Empires (C++, Custom, mature, inactive since 2016)
• Bitfighter (C, C++, GPL-2.0, mature)
• BitRiot (C++, Apache-2.0, beta, inactive since 2017)
• Black Shades Elite (?, ?, beta, inactive since 2007)
• BlackNova Traders (PHP, JavaScript, GPL-2.0, beta, inactive since 2012)
• Blackvoxel (C++, GPL-3.0, mature)
• Bladecoder Adventure Engine (Java, Apache-2.0, mature)
• BlakedAwesomenaughts (JavaScript, PHP, MIT, beta, inactive since 2015)
• Blasphemer (None, None, mature, inactive since 2017)
• Blender game engine (C++, GPL-2.0, mature)
• Blinken (C++, GPL-2.0, mature)
• Blitwizard (C, C++, Lua, zlib, beta, inactive since 2015)
• Blitzkrieg (Java, GPL-3.0, beta, inactive since 2012)
• Blob Wars : Attrition (C, C++, GPL-3.0, mature)
• Blob Wars Episode 2 : Blob And Conquer (C++, GPL, mature, inactive since 2016)
• Blobby Volley 2 (C++, GPL-2.0, mature, inactive since 2017)
• Bloboats (C++, GPL-2.0, mature, inactive since 2006)
• Blobwars: Metal Blob Solid (C++, GPL-2.0, mature)
• Block Attack - Rise of the Blocks (C++, GPL-2.0, mature)
• BlockOut II (C++, GPL-2.0, mature, inactive since 2014)
• Bloodmasters (C#, GPL, mature, inactive since 2008)
• boardgame.io (JavaScript, TypeScript, MIT, beta)
• BomberClone (C, GPL-2.0, beta, inactive since 2010)
• Bombermaaan (C++, GPL-3.0, mature, inactive since 2010)
• Bombic2 (C++, ?, beta, inactive since 2010)
• Bombic (C++, Objective-C, GPL-2.0, beta, inactive since 2005)
• Bombman (Python, CC0, mature)
• Boohu (Go, ISC, beta)
• BOOM: Remake (C++, Custom, mature)
• Boost (C++ Libraries) (C++, Boost-1.0, mature)
• Bos Wars (C++, GPL-2.0, mature, inactive since 2013)
• Boson (C++, GPL-2.0, beta, inactive since 2006)
• Boulder Dash (Java, MIT, mature, inactive since 2015)
• Bouncy the Hungry Rabbit (Python, GPL-2.0, mature, inactive since 2007)
• Box2D (C, C++, Objective-C, zlib, mature)
• Brain Workshop (Python, GPL-2.0, mature, inactive since 2011)
• bratwurst (Lisp, GPL-2.0, mature, inactive since 2009)
• Breakout-VR (C#, MIT, beta, inactive since 2017)
• Bridge Command (C++, GPL-2.0, mature)
• Brikx (C++, GPL-2.0, beta, inactive since 2009)
• BRIQUOLO (C++, GPL-3.0, mature, inactive since 2008)
• British Bingo (JavaScript, GPL-3.0, mature)
• Brogue (C, AGPL, mature)
• BrowserQuest (JavaScript, MPL-2.0, mature)
• Brutal Chess (C++, GPL-2.0, beta, inactive since 2007)
• BStone (C++, GPL-2.0, mature)
• Bt Builder (C, C++, GPL-3.0, beta)
• buggyGame (Python, GPL-2.0, beta, inactive since 2007)
• BurgerSpace (C++, GPL-2.0, mature, inactive since 2013)
• Bygfoot (Java, GPL-2.0, beta)
• BZFlag (C++, LGPL-2.1, MPL-2.0, mature)
• C-Dogs SDL (C, GPL-2.0, mature)
• C-evo (Pascal, Public domain, GPL-3.0, mature, inactive since 2013)
• C3DE (C#, MIT, beta)
• c64-nuclearreaction (C, Assembly, GPL-3.0, mature, inactive since 2014)
• Cabbages and Kings (Python, MIT, mature)
• Cadaver (C++, GPL-2.0, beta, inactive since 2009)
• CaesarIA (C++, JavaScript, GPL-3.0, beta)
• Candy Box 2 (TypeScript, JavaScript, GPL-3.0, mature, inactive since 2013)
• Cannonball (C++, MAME, beta)
• CannonSmash (C++, GPL-2.0, beta, inactive since 2003)
• Canta (Python, GPL-3.0, beta, inactive since 2011)
• Caph (C, GPL-3.0, mature, inactive since 2010)
• Card Stories (JavaScript, Python, AGPL-3.0, beta, inactive since 2012)
• Cart Life (AGS Script, Custom, mature, inactive since 2014)
• Castle Game Engine (Pascal, LGPL-2.0, mature)
• Castle of the Winds in Elm (Elm, JavaScript, ???, beta)
• Castle of the Winds (JavaScript, MIT, beta, inactive since 2016)
• Castle-Combat (Python, GPL-2.0, beta, inactive since 2006)
• Cat Mother Dead Justice (C++, 3-clause BSD, GPL-2.0, beta, inactive since 2003)
• Cataclysm: Dark Days Ahead (C++, CC-BY-SA-3.0, mature)
• Cataclysm (C++, CC-BY-SA-3, beta, inactive since 2012)
• CatacombGL (C++, GPL-3.0, beta)
• CatacombSDL (C, GPL-2.0, mature, inactive since 2014)
• Catch Challenger (C++, GPL-3.0, mature)
• CaveExpress (C, GPL-3.0, mature)
• CavePacker (JavaScript, C, C++, Lua, GPL-3.0, mature)
• CAVEZ of PHEAR (C, GPL-3.0, beta, inactive since 2011)
• CBoard (C, GPL-2.0, beta, inactive since 2018)
• cc94 (C++, Python, AGPL-3.0, beta)
• CCCP (C++, AGPL-3.0, beta)
• Celestron (Python, GPL-3.0, beta, inactive since 2012)
• CETech (C, C++, CC0, beta)
• chainreaction (Java, LGPL-3.0, mature, inactive since 2017)
• Chaos Esque Anthology (?, ?, mature)
• Chess3D (JavaScript, Pytghon, GPL-3.0, mature, inactive since 2016)
• Children of Ur (Dart, JavaScript, MIT, beta)
• Childsplay (Python, GPL-3.0, mature)
• Chocolate Doom (C, GPL-2.0, mature)
• Chocolate Duke3D (C, GPL-2.0, Custom, beta)
• Choria (C++, C, Lua, GPL-3.0, mature)
• Chromium B.S.U. (C++, Artistic License, mature)
• Chronoshift (C++, GPL-2.0, beta)
• Chrzaszcz (C++, GPL-3.0, beta, inactive since 2018)
• Chunk Stories (Kotlin, Java, LGPL-3.0, beta)
• Circus Linux! (C, GPL-2.0, mature, inactive since 2000)
• Civil (Python, GPL-2.0, beta, inactive since 2003)
• Civilization: Call To Power 2 Source Project (C, C++, Custom, mature)
• Civitas (Java, Blender, GPL-2.0, beta, inactive since 2017)
• CivOne (C#, CC0, beta)
• ClanLib (C, C++, zlib, mature)
• Classic Blades of Exile (C++, GPL-2.0, mature)
• Classic RBDoom 3 BFG (C, C++, GPL-3.0, mature)
• Clonepoint (C++, GPL-3.0, beta)
• Clumsy Bird (JavaScript, MIT, mature, inactive since 2017)
• coab (C#, ???, mature)
• COCOS2D-X (C++, MIT, mature)
• Colditz Escape (C, GPL-3.0, mature)
• Colobot: Gold Edition (C++, GPL-3.0, mature)
• Colonization too (C++, GPL-2.0, beta, inactive since 2004)
• Colossal Cave Adventure (Python, Apache-2.0, mature)
• Combat Simulator Project (C++, GPL-2.0, beta, inactive since 2010)
• Commander Genius (C, C++, GPL-2.0, mature)
• CommandoJS (JavaScript, CoffeeScript, MIT, beta, inactive since 2012)
• Conquest (C++, MIT, mature)
• Conquests (C++, GPL-2.0, mature, inactive since 2012)
• Consomaton (TypeScript, MIT, mature, inactive since 2016)
• Construo (C++, GPL-3.0, beta, inactive since 2015)
• Core War (C, Java, GPL-2.0, 2-clause BSD, mature)
• CorEngine (C, zlib, beta, inactive since 2015)
• CorsixTH (Lua, C++, MIT, mature)
• Cosmosmash (C++, GPL-2.0, mature, inactive since 2013)
• Crack Attack! (C++, GPL-2.0, mature, inactive since 2005)
• Craft (C, Python, MIT, mature, inactive since 2017)
• CrappyBird (JavaScript, MIT, mature, inactive since 2017)
• Creep Smash (Java, GPL-3.0, beta, inactive since 2011)
• Crimson Fields (C++, GPL-2.0, mature, inactive since 2010)
• Critterding (C++, GPL-2.0, beta, inactive since 2013)
• Crossfire (C, Java, GPL-2.0, mature)
• CrossUO (C, C++, GPL-3.0, mature)
• Crosswords (Java, GPL-2.0, mature)
• Crown and Cutlass (C++, Custom, beta, inactive since 2009)
• Crown (C, C++, Vala, MIT, beta)
• Crypto++ (C++, Boost-1.0, mature)
• CrystalQuest (JavaScript, MIT, mature, inactive since 2017)
• Cubosphere (C, C++, GPL-3.0, beta)
• Cultivation (C++, ?, mature, inactive since 2010)
• Curse of War (C, C++, GPL-3.0, mature, inactive since 2014)
• CuteMaze (C++, GPL-3.0, mature)
• Cuyo (C++, GPL-2.0, mature, inactive since 2014)
• Cytadela (C++, GPL-3.0, beta, inactive since 2013)
• D-Fend Reloaded (Pascal, GPL-3.0, mature, inactive since 2015)
• D2X-XL (C++, Custom, GPL-2.0, mature, inactive since 2015)
• Daggerfall Unity (C#, MIT, mature)
• Daimonin (C, GPL-2.0, mature)
• Danger from the Deep (C++, GPL-2.0, beta, inactive since 2011)
• Dark Destiny (Java, JavaScript, GPL, mature, inactive since 2016)
• Dark Oberon (C++, GPL-2.0, mature, inactive since 2009)
• DarkCity (PHP, GPL-3.0, mature, inactive since 2012)
• DarkPlaces (C, GPL-2.0, mature, inactive since 2014)
• Dash Engine (D, MIT, mature, inactive since 2015)
• Data Storm (C, Apache-2.0, mature, inactive since 2017)
• Dave Gnukem (C++, GPL-2.0, mature)
• Dawn (C++, GPL-3.0, beta, inactive since 2011)
• Dear ImGui (C, C++, MIT, mature)
• Deathchase 3D (C, Perl, GPL-2.0, mature, inactive since 2002)
• Decker (Java, GPL-2.0, beta, inactive since 2013)
• Dedalus (JavaScript, GPL-2.0, beta, inactive since 2018)
• Deer Portal (C++, zlib, beta)
• Defendguin (C, GPL-2.0, mature, inactive since 2009)
• Deity (Python, GPL-2.0, mature, inactive since 2014)
• Deliantra (C, GPL-2.0, mature)
• Delta Engine (C#, Apache-2.0, mature, inactive since 2015)
• DelverEngine (Java, Custom, beta)
• DemiGod (Java, GPL-3.0, beta, inactive since 2013)
• Der Clou! (C, Custom, beta, inactive since 2017)
• DesktopAdventures (C, LGPL-2.1, beta)
• DeSmuME (C, C++, GPL-2.0, mature, inactive since 2015)
• Destination Sol (Java, Apache-2.0, mature)
• Devana (PHP, zlib, beta)
• Devilution (C, C++, Unlicense, mature)
• DevilutionX (C, C++, Unlicense, mature)
• DGEngine (C++, zlib, GPL-3.0, beta)
• dhewm3 (C, C++, GPL-3.0, mature)
• diablo-js (Java, JavaScript, MIT, mature)
• Digbuild (C, C++, GPL-2.0, beta, inactive since 2011)
• Digger Remastered (C, GPL-2.0, mature, inactive since 2004)
• Digital: A Love Story (Ren'py, CC-BY-NC-SA, mature)
• Dingo-Engine (Java, 3-clause BSD, beta, inactive since 2016)
• DirectPython (C++, ?, beta, inactive since 2007)
• DirectX12GameEngine (C#, MIT, beta)
• DNT (C++, GPL-3.0, beta, inactive since 2016)
• Do It Yourself Doom With SDL (C++, MIT, beta)
• Domination (Java, GPL-3.0, mature)
• Domino On Acid (Java, GPL-2.0, mature, inactive since 2009)
• Doom Legacy (C++, GPL-2.0, mature)
• DOOM Retro (C, C++, GPL-3.0, mature)
• DOOM-iOS (C++, GPL-2.0, mature, inactive since 2012)
• Doom64EX (C, C++, GPL-2.0, mature)
• DOOM (C, Custom, mature, inactive since 2012)
• Doomsday Engine (C, C++, GPL-2.0, GPL-3.0, LGPL-3.0, mature)
• Dope Wars (C, GPL-2.0, mature, inactive since 2013)
• Doxygen (C++, GPL-2.0, mature)
• Dragon History - Dračí Historie (Pascal, Script, GPL-2.0, mature, inactive since 2010)
• Dragon Hunt (Python, GPL-2.0, mature)
• DreamChess (C, GPL-3.0, beta)
• Dreerally (C, C++, Custom, beta)
• DRL (Lua, Pascal, GPL-2.0, mature)
• Duck Marines (Lua, zlib, mature, inactive since 2016)
• Duel Commander (C, GPL-3.0, beta, inactive since 2009)
• Duke3D (C, GPL-2.0, beta, inactive since 2009)
• Duke3d_w32 (C, GPL-2.0, beta, inactive since 2008)
• Dune 2 - The Maker (Java, MIT, beta)
• Dune Dynasty (C, GPL-2.0, mature, inactive since 2014)
• Dune II - The Maker (Java, MIT, beta)
• Dune Legacy (C++, GPL-2.0, mature)
• Dungeon Craft (C++, GPL-2.0, mature)
• Dungeon Crawl Stone Soup (C++, Lua, GPL-2.0, mature)
• Dungeon Hero (Java, MIT, mature)
• Dungeon Mapper (C++, GPL-3.0, beta, inactive since 2013)
• Dungeon Monkey Eternal (Python, GPL-2.0, mature, inactive since 2016)
• Dungeon Quest (Java, MIT, mature)
• Dunnet (Emacs Lisp, GPL-3.0, mature, inactive since 1992)
• Dust Racing 2D (C, C++, GPL-3.0, mature)
• DwarfCorp (C#, MIT, mature)
• DXX-Rebirth (C, C++, Python, GPL-3.0, Custom, mature)
• EasyRPG Player (C++, GPL-3.0, mature)
• Eat The Whistle (C, ?, mature, inactive since 2017)
• Ecksdee (C++, GPL-2.0, beta, inactive since 2009)
• ECWolf (C++, GPL-2.0, BSD, LGPL-2.1, Libpng, zlib, bzip2, MIT, IJG, Public domain, mature)
• EDuke32 (C, C++, GPL-2.0, mature)
• Egoboo (C++, C, GPL-3.0, mature, inactive since 2015)
• Einstein Puzzle (C++, GPL-2.0, mature, inactive since 2005)
• Emilia Pinball (C++, GPL-2.0, beta)
• Empty Clip (C++, GPL-2.0, mature)
• EmptyEpsilon (C, C++, Lua, GPL-2.0, mature)
• Endgame: Singularity (Python, GPL-2.0, beta)
• Endless Sky (C++, GPL-3.0, mature)
• Enduro tribute (JavaScript, MIT, mature)
• ENIGMA (development environment) (C++, C, GPL-3.0, mature)
• Enigma (C, C++, GPL-2.0, mature)
• EnTT Pacman (C, C++, MIT, mature)
• Eos, Dawn of Light: A Space Opera (Python, MIT, beta, inactive since 2007)
• Epiar (C, C++, Lua, GPL-2.0, beta)
• EPOH (JavaScript, MIT, beta)
• erampage (C, GPL-2.0, beta, inactive since 2015)
• Erebus (C++, GPL-3.0, beta)
• Escape Towards The Unknown (C, GPL-2.0, beta, inactive since 2016)
• Esenthel Engine (C, C++, Custom, beta)
• ET: Legacy (C, C++, Lua, GPL-3.0, mature)
• Eternal Lands (C, C++, Custom, mature)
• EternalWinterWars (Java, MIT, beta, inactive since 2014)
• Etterna (C, C++, Lua, MIT, beta)
• Evil Cult (Haxe, JavaScript, GPL-3.0, mature)
• Evol Online (C, GPL-3.0, mature)
• Excellent Bifurcation (C, GPL-2.0, mature, inactive since 2007)
• Executive Man (JavaScript, Custom, mature, inactive since 2017)
• Extreme Tux Racer (C++, GPL-2.0, beta, inactive since 2018)
• Exult (C++, GPL-2.0, mature)
• ezQuake (C, C++, GPL-2.0, mature)
• F-1 Spirit (C++, ??, beta, inactive since 2009)
• F.LF (JavaScript, ?, mature)
• Fairy-Max (C, Custom, mature, inactive since 2018)
• Falcon's Eye (C, NetHack General Public License, mature, inactive since 2004)
• Fall of Imiryn (C++, Python, GPL-3.0, beta, inactive since 2009)
• Fallen Spire (Python, GPL-3.0, beta, inactive since 2009)
• Falling Time (C, C++, GPL-2.0, mature)
• Falltergeist (C++, GPL-3.0, beta)
• Fantasy Map Generator (JavaScript, MIT, mature)
• Fanwor (C, GPL-2.0, mature)
• FAR Colony (Pascal, GPL-3.0, beta, inactive since 2014)
• Fictional Air Combat (C, C++, GPL-3.0, beta, inactive since 2012)
• FIFE (C++, Python, LGPL-2.1, beta)
• First Strike (Java, MIT, mature)
• Fish Fillets - Next Generation (C++, GPL-2.0, mature)
• Flappy Cow (Java, MIT, mature)
• Flare (C++, Java, GPL-3.0, mature)
• Flex Engine (C++, MIT, beta)
• FlightGear (C++, GPL-2.0, mature)
• flixel-gdx (Java, 3-clause BSD, beta, inactive since 2017)
• Flixel (ActionScript, MIT, mature)
• FLTK Recycling Game! (C++, LGPL-2.1, mature, inactive since 2014)
• FLTrator (C++, GPL-3.0, mature, inactive since 2016)
• Fluid Table Tennis (JavaScript, MIT, mature, inactive since 2013)
• Flukz (C++, GPL-2.0, beta, inactive since 2014)
• fonline (C, C++, GPL-3.0, beta)
• FooBillard++ (C, GPL-2.0, mature, inactive since 2012)
• FooBillard (C, GPL-2.0, mature, inactive since 2010)
• Forsaken (C, C++, GPL-2.0, Proprietary, beta, inactive since 2013)
• FQuake3 (F#, GPL-2.0, beta, inactive since 2014)
• fRaBs (Lisp, Public domain, mature, inactive since 2016)
• Free Heroes 2 (C++, GPL-2.0, beta, inactive since 2015)
• Free in the Dark (engine) (C, C++, GPL-2.0, beta)
• Free Mars (Java, GPL-3.0, mature)
• Free Space Colonization (C, GPL-2.0, beta, inactive since 2017)
• Free Tennis (OCaml, GPL-2.0, beta, inactive since 2005)
• freeablo (C++, GPL-3.0, beta)
• freeaoe (C++, GPL-3.0, beta)
• FreeBlocks (C, Java, GPL-3.0, beta, inactive since 2015)
• Freeciv Alpha Centauri project (C, GPL-2.0, beta, inactive since 2003)
• Freeciv-web (JavaScript, Java, Python, AGPL-3.0, mature)
• Freeciv (C, GPL-2.0, mature)
• FreeCol (Java, GPL-2.0, mature)
• FreeCS (QuakeC, GPL-2.0, mature)
• Freedoom (Not applicable, Not applicable, beta)
• FreedroidRPG (C, C++, Lua, GPL-2.0, mature)
• FreeFalcon (C, C++, 2-clause BSD, inactive since 2014)
• freegish (C, GPL-2.0, beta, inactive since 2017)
• Freekick 3 (C++, Python, GPL-3.0, mature, inactive since 2015)
• FreeLords (Java, GPL-2.0, beta)
• Freeminer (C++, Lua, GPL-3.0, beta)
• Freenukum Jump'n Run (C, GPL-3.0, beta, inactive since 2009)
• FreeOrion (C++, Python, GPL-2.0, beta)
• FreePrince (C, GPL-2.0, beta, inactive since 2011)
• FreeRails (Java, C++, GPL-2.0, beta, inactive since 2008)
• FreeRCT (C++, GPL-2.0, beta, inactive since 2016)
• Freeserf (C, C++, GPL-3.0, mature)
• FreeSiege (C++, GPL-3.0, beta)
• FreeSims (C#, MPL-2.0, beta)
• FreeSO (C#, MPL-2.0, beta)
• Freestars (C++, GPL-2.0, beta, inactive since 2008)
• FreeSynd (C++, GPL-2.0, beta, inactive since 2017)
• FreeTrain (C#, LGPL-2.1, beta, inactive since 2009)
• FreeType (C, GPL-2.0, Custom, mature)
• freeVikings (Ruby, GPL-2.0, beta)
• Frets on Fire X (Python, GPL-2.0, mature)
• Frets on Fire (Python, GPL-2.0, mature, inactive since 2008)
• Friking Shark (C++, GPL-3.0, mature)
• Froggix (Python, GPL-3.0, beta, inactive since 2009)
• Frozen Bubble (Perl, GPL-2.0, mature, inactive since 2012)
• Fujo (Python, CC-BY-SA-4.0, mature, inactive since 2014)
• Galaxy Forces V2 (C++, ?, mature)
• GalaxyMage Redux (Python, GPL-2.0, beta, inactive since 2011)
• GalaxyNG (C, GPL-2.0, mature, inactive since 2005)
• GameCake (C, C++, Lua, MIT, mature)
• GameLV (C++, GPL-2.0, beta)
• Gang Garrison 2 (Game Maker Script, MPL, mature)
• Garith (C++, LGPL-2.1, mature, inactive since 2013)
• GCompris (C, Python, GPL-3.0, mature, inactive since 2016)
• GDash (C++, MIT, beta)
• GDHexGrid (GDScript, MIT, mature)
• GearHead 2 (Pascal, LGPL-2.0, beta)
• GearHead (Pascal, LGPL-2.1, Apache-2.0, mature)
• Gee Whiz (C, GPL-2.0, beta, inactive since 2004)
• Gem Drop X (C, GPL-2.0, beta, inactive since 2002)
• GemRB (C++, Python, GPL-2.0, mature)
• GeonBit.UI (C#, MIT, mature)
• ges-code (C, C++, GPL-3.0, mature)
• Ghostly (C++, GPL-3.0, mature, inactive since 2016)
• Gift Grabber (JavaScript, Apache-2.0, mature)
• Gigalomania (C++, GPL-2.0, mature)
• Gilbert and the doors (C, GPL-3.0, mature, inactive since 2018)
• gist-txt (JavaScript, MIT, mature, inactive since 2018)
• GJID (C++, MIT, mature, inactive since 2017)
• GL-117 (C++, GPL-2.0, mature, inactive since 2005)
• GL4ES (C, MIT, mature)
• Glest (C++, GPL-2.0, mature, inactive since 2009)
• Globulation 2 (C++, GPL-3.0, mature)
• glParchis (Python, GPL-3.0, mature)
• glPortal (C++, zlib, beta)
• GLtron (C, GPL, beta, inactive since 2017)
• GM Tools (C++, GPL-2.0, beta, inactive since 2004)
• Gnome Chess (Vala, GPL-3.0, mature)
• Gnome Hearts (Python, GPL-2.0, mature, inactive since 2015)
• Gnomescroll (C, C++, Python, GPL-3.0, beta, inactive since 2013)
• GNU Chess (C++, GPL-3.0, mature, inactive since 2017)
• GNU FreeDink (C, GPL-3.0, mature, inactive since 2012)
• GNU Go (C, GPL-3.0, mature, inactive since 2011)
• Go Ollie! (?, GPL-3.0, mature, inactive since 2011)
• Goblin Camp (C++, GPL-3.0, beta, inactive since 2012)
• Goblin Hack (C++, GPL-2.0, beta, inactive since 2009)
• Godot (C, C++, MIT, mature)
• GoldenEye: Source (C++, C, GPL-3.0, mature, inactive since 2018)
• Golly (C++, Java, GPL-2.0, mature)
• Gorc (C++, Apache-2.0, beta)
• Gorillas-rs (Rust, MIT, beta)
• Gorillas (Objective-C, JavaScript, Java Research License, mature, inactive since 2014)
• GoRogue (C#, MIT, mature)
• Gottet (C++, GPL, mature)
• GPL Arcade Volleyball (C++, GPL-2.0, beta, inactive since 2006)
• Grabble (Java, ?, mature, inactive since 2006)
• Grail (C++, Lua, GPL-3.0, beta, inactive since 2013)
• Gravitation (C++, Public domain, mature, inactive since 2008)
• Greenius' Civil War (C++, GPL-2.0, beta, inactive since 2001)
• Griefly (C++, Go, Python, MIT, beta)
• Grimsonland (JavaScript, ?, mature, inactive since 2017)
• Grit Game Engine (C++, Python, MIT, beta)
• Grobots (C++, GPL-2.0, mature, inactive since 2014)
• GUSANOS (C++, GPL-2.0, beta, inactive since 2006)
• Gusty's Serpents (C++, GPL-3.0, beta, inactive since 2014)
• Gweled (C, GPL-2.0, mature)
• GZDoom (C, C++, GPL-3.0, mature)
• H-Craft Championship (C++, zlib, mature, inactive since 2015)
• H-World (C, Lua, GPL-2.0, beta, inactive since 2005)
• Hack (C, BSD, mature, inactive since 1985)
• Hale (Java, GPL-2.0, beta, inactive since 2014)
• Hammer of Thyrion (C, GPL-2.0, mature)
• Hardwar (C++, GPL-3.0, beta, inactive since 2015)
• HarfBuzz (C++, MIT, mature)
• Harmonist: Dayoriah Clan Infiltration (Go, ISC, beta)
• Harris (C, Python, GPL-3.0, beta)
• HaxeFlixel (Haxe, MIT, mature)
• Haxima (C++, GPL-3.0, beta)
• Head over Heels (C++, GPL-3.0, mature)
• Heart of the Alien (C, GPL-2.0, beta, inactive since 2005)
• Hedgewars (Lua, C, C++, Pascal, Haskell, GPL-2.0, mature)
• Help Hannah's Horse (C++, GPL-2.0, beta, inactive since 2008)
• Hematite (Rust, MIT, beta)
• Hero of Allacrost (C++, Lua, GPL-2.0, mature)
• Heroes of Wesnoth (C++, GPL-3.0, beta, inactive since 2010)
• Heroes of Wing Commander (Python, GPL-3.0, beta, inactive since 2014)
• Hex Game (C++, MIT, beta)
• Hex-a-hop (C++, GPL-2.0, mature, inactive since 2013)
• HexGL (JavaScript, CoffeeScript, MIT, mature, inactive since 2016)
• heXon (C++, GPL-2.0, beta)
• Hexoshi (Python, GPL-3.0, beta, inactive since 2016)
• Hextris (JavaScript, GPL-3.0, mature)
• Hexwar (Ruby, JavaScript, MIT, beta, inactive since 2012)
• HHexen (C, GPL-2.0, mature, inactive since 2013)
• Hnefatafl (C, ISC, beta, inactive since 2014)
• Hocoslamfy (C, C++, GPL-2.0, beta, inactive since 2016)
• HoDoKu (Java, GPL-3.0, mature, inactive since 2013)
• Holtz (C++, GPL, mature)
• HolySpirit (C++, GPL-3.0, beta, inactive since 2013)
• Hopson-Arcade (C++, GPL-3.0, mature)
• HoverRace (C++, Custom NC, mature, inactive since 2016)
• Hovertank3D (C++, Assembly, GPL-2.0, mature, inactive since 2014)
• HTML5 Pacman (JavaScript, WTFPL, mature, inactive since 2013)
• Hypatia (Python, MIT, beta, inactive since 2016)
• Hypercube (Java, GPL-2.0, mature, inactive since 2016)
• HyperRogue (C++, GPL-2.0, mature)
• I Have No Tomatoes (C++, zlib, mature, inactive since 2004)
• ICBM3D (C, ?, beta, inactive since 1998)
• Ice Breaker (C, GPL-2.0, mature, inactive since 2003)
• Iceball (C, Lua, GPL-3.0, inactive since 2017)
• ika (C++, Python, PHP, C#, GPL-2.0, beta, inactive since 2007)
• Ilarion (C++, Java, Lua, GPL-3.0, mature)
• Imperium (?, ?, mature)
• Inexor (C++, JavaScript, zlib, beta, inactive since 2018)
• Infiniminer (C#, MIT, mature, inactive since 2016)
• Infinite Tux (Java, GPL-3.0, Public domain, mature)
• Infon Battle Arena (C, Lua, GPL, beta, inactive since 2012)
• Intricacy (Haskell, GPL-3.0, beta)
• IO Reboot (C#, MIT, mature, inactive since 2017)
• ioquake3 (C, GPL-2.0, mature)
• iortcw (C, C++, GPL, mature)
• Iris2 (C, C++, Lua, GPL-3.0, beta, inactive since 2017)
• Iron Seed (Pascal, GPL-3.0, mature, inactive since 2013)
• irrlamb (C, C++, GPL-3.0, mature)
• Irrlicht Engine (C++, C, zlib, mature)
• Isometric Turn-Based Strategy (Python, MIT, beta)
• Iter Vehemens ad Necem (C++, GPL-2.0, beta)
• Jagged Alliance 2 Stracciatella (C, C++, Custom, mature)
• Jake2 (Java, GPL-2.0, beta, inactive since 2006)
• Jamp (C++, GPL-3.0, beta, inactive since 2009)
• JaNaG - Java Name Generator (Java, GPL-3.0, mature, inactive since 2016)
• javascript-E.T. (JavaScript, Assembly, MIT, beta, inactive since 2017)
• Javelin (Java, GPL-2.0, mature, inactive since 2016)
• Jazz² Resurrection (C#, JavaScript, GPL-3.0, mature)
• jClassicRPG (Java, LGPL version 3.0, beta, inactive since 2010)
• JediOutcastLinux (C, C++, GPL-2.0, mature)
• Jet-Story (Assembly, C, C++, MIT, beta)
• jewelthief (Java, GPL-3.0, mature, inactive since 2016)
• JFDuke3D (C, GPL-2.0, beta, inactive since 2005)
• JiGS Interactive Game System (JavaScript, PHP, GPL-3.0, beta)
• jMonkeyEngine (Java, 3-clause BSD, mature)
• JonoF's Shadow Warrior Port (JFSW) (C, GPL-2.0, beta, inactive since 2005)
• JQuest (Java, GPL-2.0, beta, inactive since 2006)
• JSettlers (Java, GPL-3.0, mature)
• jsFO (JavaScript, Python, Apache-2.0, beta, inactive since 2017)
• JSkat (Java, GPL-3.0, Apache-2.0, beta)
• JSoko (Java, GPL, mature)
• Julius (C, C++, AGPL-3.0, mature)
• Jump'n'Bump (C, GPL-2.0, mature, inactive since 2004)
• Just another Tetris™ clone (Java, WTFPL, mature, inactive since 2017)
• KaM Remake (Pascal, AGPL-3.0, mature)
• Kartering (C, GPL-2.0, MIT, ISC, beta, inactive since 2015)
• KAtomic (C++, GPL-2.0, mature)
• Keen Dreams (C, Assembly, C++, GPL-2.0, mature, inactive since 2014)
• KeeperRL (C, C++, GPL-2.0, beta)
• Key Runner (C++, GPL-3.0, mature, inactive since 2013)
• KGoldrunner (C++, GPL-2.0, mature)
• kiki the nano bot (C++, Public domain, mature, inactive since 2007)
• Kingdoms (C++, GPL-3.0, beta, inactive since 2014)
• KittenMaxit (Java, MIT, beta)
• KKnD (C#, GPL-3.0, beta)
• Klooni 1010! (Java, GPL-3.0, beta)
• KMines (C++, GPL-2.0, mature)
• KnightOfWor (Java, GPL-3.0, beta, inactive since 2015)
• Knights (C++, GPL-3.0, beta, inactive since 2014)
• Kobo Deluxe (C++, GPL-2.0, LGPL, beta, inactive since 2007)
• Kobold's Quest 2 (Python, LGPL-3.0, beta, inactive since 2011)
• KQ Lives (C, GPL-2.0, beta, inactive since 2011)
• Krank (Python, Public domain, beta, inactive since 2008)
• Krystal Drop (C++, GPL-2.0, beta, inactive since 2004)
• KSnakeDuel (C++, GPL-2.0, mature)
• Ksudoku (C++, GPL-2.0, mature)
• Kuklomenos (C++, GPL-3.0, beta, inactive since 2012)
• L'Abbaye des Morts (C, GPL-3.0, mature, inactive since 2018)
• l-echo (C++, GPL-3.0, beta, inactive since 2016)
• Labyrinth of Worlds (C++, LGPL-3.0, beta, inactive since 2010)
• ladder (Go, MIT, beta, inactive since 2016)
• Ladder (Java, GPL-2.0, mature, inactive since 2005)
• LambdaHack (Haskell, 3-clause BSD, beta)
• LambdaRogue: The Book of Stars (FreePascal, GPL-2.0, mature, inactive since 2012)
• Land of Fire (Custom, GPL-2.0, beta)
• LastTry (Java, MIT, beta, inactive since 2017)
• LBreakout2 (C, GPL-2.0, mature, inactive since 2010)
• LBreakoutHD (C++, GPL-3.0, mature)
• Lemmings.ts (TypeScript, MIT, mature)
• Lemmini (Java, Apache-2.0, beta, inactive since 2017)
• LevelHead (C++, Python, GPL-3.0, mature, inactive since 2009)
• Lexica (Java, GPL-3.0, mature)
• LGames (C++, GPL-2.0, mature)
• LGeneral (C, GPL-2.0, mature, inactive since 2017)
• Liberal Crime Squad (C++, GPL-2.0, mature, inactive since 2012)
• Liberation Circuit (C, GPL-3.0, mature)
• libGDX (Java, C++, C, Apache-2.0, mature)
• libpng (C, Custom, mature)
• Libre Pinball (GDScript, MIT, beta, inactive since 2015)
• Libre: The Open Source Card Game (??, ??, mature, inactive since 2010)
• Librelancer (C, C#, MIT, beta)
• Libxml2 (C, MIT, mature)
• LieroLibre (C++, 2-clause BSD, mature, inactive since 2017)
• Lightweight Java Game Library (Kotlin, C, 3-clause BSD, mature)
• LIKO-12 (Lua, MIT, mature)
• Limbs Off (C++, GPL-3.0, beta, inactive since 2013)
• LinCity-NG (C++, GPL-2.0, mature)
• Lincity (C, GPL-2.0, mature, inactive since 2005)
• Linley's Dungeon Crawl (C, Custom, mature, inactive since 2006)
• Linwarrior 3D (C++, Apache-2.0, mature, inactive since 2010)
• LionEngine (Java, GPL-3.0, mature)
• Lionheart Remake (Java, GPL-3.0, beta, inactive since 2018)
• Lips of Suna (C, GPL-3.0, beta, inactive since 2014)
• Liquid War (C, GPL-3.0, mature, inactive since 2015)
• Lix (D, C++, CC0, beta)
• Lords of the Fey (JavaScript, AGPL-3.0, beta, inactive since 2018)
• LordsAWar! (C++, GPL-3.0, mature)
• Lose Your Marbles (JavaScript, MIT, mature, inactive since 2014)
• LTris (C, GPL-2.0, mature, inactive since 2013)
• lttp-phaser (TypeScript, JavaScript, MIT, beta, inactive since 2016)
• Lua (C, MIT, mature)
• Lugaru (C++, GPL-2.0, mature)
• Lumix Engine (C++, MIT, beta)
• Luola (C, GPL-2.0, mature, inactive since 2005)
• LZMA SDK (C, LGPL-2.0, mature)
• LÖVE (C++, zlib, mature)
• M.A.R.S. (C++, C, GPL-3.0, beta, inactive since 2016)
• M.E.W.L. (C++, GPL-2.0, beta, inactive since 2015)
• Machinations (C++, GPL-2.0, beta, inactive since 2003)
• Maelstrom (C, C++, GPL-2.0, mature, inactive since 2002)
• Magarena (Java, Groovy, GPL-3.0, mature)
• MAGE - Matthias Advanced Game Engine (C++, GPL-3.0, beta)
• Magic Gardeners Tournament (Python, GPL-2.0, beta, inactive since 2007)
• Magical Life (C#, MIT, beta)
• Mah-Jong (C, GPL-2.0, mature)
• Mana (C++, GPL-2.0, beta)
• Maniadrive (PHP, GPL, mature, inactive since 2008)
• Manic Digger (C#, Public domain, Unlicense, mature, inactive since 2017)
• Maratis (C++, GPL-2.0, beta)
• Marble Marcher (C++, GPL-2.0, mature)
• Marblez (C#, MIT, beta, inactive since 2017)
• Mari0 (Lua, MIT, mature, inactive since 2012)
• Mario Objects (C#, MIT, beta)
• Mars, Land of No Mercy (C++, GPL-2.0, beta, inactive since 2008)
• Maxit (C++, ?, mature, inactive since 2014)
• Me and My Shadow (C++, GPL-3.0, beta)
• Mechanized Assault & eXploration Reloaded (C++, C, GPL-2.0, beta)
• MechCommander 2 Omnitech (C++, Ms-PL, beta, inactive since 2013)
• Mega Mario (C++, LGPL-2.1, mature, inactive since 2012)
• MegaGlest (C, C++, GPL-3.0, mature)
• MegaMek (Java, GPL-2.0, mature)
• Memory Game (Java, Apache-2.0, mature)
• Mercenary Commander (Java, 3-clause BSD, beta, inactive since 2010)
• Meridian 59 (C++, C, GPL-2.0, mature)
• Meritous (C, GPL-3.0, mature, inactive since 2008)
• Metal Mech (PHP, GPL-2.0, beta, inactive since 2006)
• Mice Men: Remix (Java, LGPL-3.0, mature, inactive since 2016)
• Micropolis (C++, Java, Python, GPL-3.0, mature, inactive since 2015)
• micropolisJS (JavaScript, GPL-3.0, mature)
• Microracers (C, C++, GPL-2.0, beta, inactive since 2005)
• MicroWar 2.0 (Python, 3-clause BSD, mature, inactive since 2009)
• Mindustry (Java, GPL-3.0, mature)
• MineCraft-One-Week-Challenge (C++, MIT, beta)
• Minesweeper (in C) (C, 3-clause BSD, beta, inactive since 2015)
• Minesweeper.Zone (JavaScript, PHP, MIT, mature)
• Minetest Game (Lua, LGPL-2.1, mature)
• Minetest (C, C++, Lua, LGPL-2.1, mature)
• mini2Dx (Java, C#, Apache-2.0, mature)
• Minilens (GDScript, GPL-3.0, mature, inactive since 2018)
• Mininim (C, GPL-3.0, beta, inactive since 2017)
• Mirror Magic (C, GPL-2.0, mature)
• mk.js (JavaScript, MIT, beta)
• mkxp (C++, C, GPL-2.0, mature)
• Mmpong (C, GPL-3.0, beta, inactive since 2009)
• Moagg2 (Java, GPL-2.0, mature, inactive since 2008)
• Mocha Doom (Java, ?, beta, inactive since 2012)
• MonoGame (C#, Ms-PL, MIT, mature)
• Monster Generator (Java, MIT, mature)
• Monsters and Mushrooms (Python, GPL-2.0, mature, inactive since 2010)
• Monstrosity (Python, MIT, mature)
• Moon-buggy (C, GPL-2.0, mature, inactive since 2006)
• Moria (C, GPL-3.0, mature)
• Morpheus Web Remake (Javascript, MIT, beta)
• movbizz (PHP, JavaScript, MIT, beta, inactive since 2015)
• Mpango (Java, GPL-2.0, beta, inactive since 2013)
• Mr. Rescue (Lua, zlib, mature, inactive since 2016)
• Mr.Boom (C++, MIT, mature)
• Mrfuze (Python, LGPL-2.1, mature, inactive since 2008)
• Mtp Target (C++, GPL-2.0, mature, inactive since 2008)
• Murder In The Public Domain (C++, GPL-3.0, mature, inactive since 2013)
• MUSoSu (Java, GPL-3.0, beta, inactive since 2008)
• n2048 (C, 2-clause BSD, beta, inactive since 2014)
• Naev (C, Lua, GPL-3.0, mature)
• Nazara Engine (C, C++, MIT, beta)
• NBlood (C, C++, Lua, GPL-2.0, mature)
• Necklace of the Eye (C++, GPL-3.0, mature, inactive since 2016)
• Netacka (C, MIT, mature)
• NetHack (C, Custom, mature)
• NetMauMau (C++, LGPL-3.0, mature, inactive since 2015)
• NetPanzer (C++, GPL-2.0, beta)
• Netrek (C, Custom, mature, inactive since 2009)
• NetStatsBaseball (C, Public domain, mature)
• Neverball (C, C++, GPL-2.0, mature)
• Nexuiz (C++, GPL-2.0, mature)
• NFSIISE (C, MIT, mature)
• Nighthawk (C++, GPL-2.0, mature, inactive since 2004)
• Nikki and the Robots (Haskell, LGPL-3.0, mature, inactive since 2012)
• Nikwi (C++, GPL-2.0, beta, inactive since 2012)
• NLarn (C, Lua, GPL-3.0, mature)
• Noiz2sa (C, C++, 2-clause BSD, beta, inactive since 2004)
• Not Pacman (Lua, WTFPL, mature, inactive since 2013)
• NOVA PINBALL (Lua, GPL-3.0, beta, inactive since 2017)
• NStars! (C#, ?, beta, inactive since 2004)
• NullpoMino (Java, 3-clause BSD, mature)
• Numpty Physics (C++, GPL-3.0, beta, inactive since 2016)
• Nuncabola (Java, GPL-2.0, beta)
• Nuvie (C, C++, Lua, GPL-2.0, beta, inactive since 2018)
• NXEngine-evo (C++, GPL-3.0, mature)
• NXEngine (C, C++, GPL-3.0, mature)
• nXtank (Python, GPL-3.0, beta, inactive since 2010)
• O.H.R.RPG.C.E. (Basic, GPL-2.0, mature)
• Octaforge (C++, Custom, mature)
• Odamex (C, C++, GPL-2.0, beta)
• OGRE3D (C++, MIT, mature)
• OGS Mahjong (C++, GPL-3.0, mature, inactive since 2016)
• Omega-rpg (C, LGPL-2.0, beta, inactive since 2000)
• Omega (Javascript, Ruby, AGPL-3.0, beta)
• Omnispeak (C, GPL-2.0, mature)
• One Hour One Life (C, C++, PHP, Public domain, mature)
• One Way To Go (Lua, GPL-3.0, mature, inactive since 2011)
• Oolite (Objective-C, C, JavaScript, GPL-2.0, mature)
• Open AL Soft (C, LGPL-2.0, mature)
• Open AL (C, Proprietary, mature)
• Open Apocalypse (C++, MIT, mature)
• Open Creatures (C, C++, Python, LGPL-2.1, beta, inactive since 2010)
• Open Cube (C++, zlib, beta, inactive since 2017)
• Open Flood (Java, MIT, mature, inactive since 2018)
• Open Fodder (C, C++, GPL-3.0, mature)
• Open Game Engine (C++, LGPL-2.1, beta, inactive since 2008)
• Open Hexagon (C++, AFL-3.0, mature)
• Open Horizon (C++, MIT, beta)
• Open Imperium Galactica (Java, LGPL-3.0, mature)
• Open Jumpgate (C++, GPL-2.0, beta, inactive since 2017)
• Open Legend RPG (Text, Custom, mature)
• Open Meridian (C, C++, GPL-2.0, mature)
• Open Panzer (JavaScript, GPL-2.0, mature)
• Open Rails (C#, GPL-3.0, mature)
• Open Rodent's Revenge (C++, MIT, beta, inactive since 2018)
• Open RPG Maker (C++, GPL-3.0, beta, inactive since 2014)
• Open RSC (Java, GPL-3.0, mature)
• Open Soccer Star (PHP, GPL-3.0, beta)
• Open Surge (C, GPL-3.0, beta)
• Open Syobon Action (C++, ?, beta, inactive since 2011)
• Open Tibia (C++, GPL-2.0, beta, inactive since 2014)
• Open Yahtzee (C++, GPL-2.0, mature, inactive since 2016)
• Open Zelda (C, C++, zlib, mature, inactive since 2015)
• openage (C++, Python, GPL-3.0, beta)
• OpenArena (C, GPL-2.0, mature, inactive since 2012)
• openblack (C, C++, GPL-3.0, beta)
• OpenBlok (C++, GPL-3.0, beta)
• OpenBlox (Python, Lua, GPL-3.0, beta, inactive since 2011)
• OpenBOR (C, C++, BSD, mature)
• OpenBVE (C#, Public domain, mature)
• OpenC1 (C#, ?, beta, inactive since 2014)
• OpenCity (C++, GPL-2.0, beta, inactive since 2015)
• OpenClaw (C++, GPL-3.0, mature)
• OpenClonk (C, C++, ISC, mature)
• OpenCrystalCaves (C++, MIT, beta, inactive since 2017)
• OpenDominion (PHP, AGPL-3.0, beta)
• openDOW (C, GPL-3.0, beta)
• OpenDUNE (C, GPL-2.0, mature)
• OpenDungeons (C++, GPL-3.0, beta)
• OpenEtG (JavaScript, MIT, beta)
• OpenFire (C, MIT, beta, inactive since 2018)
• OpenFL (Haxe, MIT, mature)
• OpenGGS (C++, GPL-2.0, beta, inactive since 2017)
• OpenGL Test Drive Remake (C, C++, GPL-3.0, mature, inactive since 2015)
• Openglad (C++, GPL-2.0, mature, inactive since 2004)
• OpenGothic (C++, MIT, beta)
• OpenHoMM (C++, GPL-3.0, beta, inactive since 2010)
• OpenHoW (C, C++, GPL-3.0, beta)
• OpenITG (C, C++, MIT, beta, inactive since 2017)
• OpenJazz (C++, GPL-2.0, beta)
• OpenJK (C, C++, GPL-2.0, beta)
• OpenKeeper (Java, GPL-3.0, beta)
• OpenLara (C++, 2-clause BSD, mature)
• OpenLiero (C++, Custom, mature, inactive since 2015)
• OpenLieroX (C++, LGPL-2.0, mature)
• OpenLoco (C++, MIT, mature)
• OpenMC2 (C++, GPL-3.0, beta, inactive since 2018)
• OpenMoM (C, C++, GPL-3.0, beta)
• OpenMOO2 (Python, GPL-2.0, beta, inactive since 2011)
• OpenMortal (C++, Perl, GPL-2.0, beta, inactive since 2006)
• openMSX (C++, GPL-2.0, mature)
• OpenMW for Android (Kotlin, GPL-3.0, mature)
• OpenMW (C++, GPL-3.0, mature)
• OpenNFS (C, C++, MIT, beta)
• OpenNotrium (C++, GPL-3.0, beta)
• OpenOMF (C, C++, MIT, beta)
• OpenRA (C#, GPL-3.0, mature)
• OpenRaider (C, C++, GPL-2.0, beta, inactive since 2015)
• OpenRCT2 (C++, GPL-3.0, mature)
• OpenRoads (TypeScript, Javascript, MIT, mature, inactive since 2014)
• OpenRPG (Python, GPL-2.0, mature, inactive since 2013)
• OpenRW (C, C++, GPL-3.0, beta)
• OpenSAGE (C#, LGPL-3.0, beta)
• OpenSC2K (JavaScript, GPL-3.0, beta)
• OpenSkyscraper (C++, GPL-2.0, beta)
• OpenSoccer (PHP, GPL-3.0, beta)
• OpenSpades (C, C++, AngelScript, GPL-3.0, beta)
• OpenSR (C++, GPL-3.0, beta, inactive since 2017)
• OpenSSL (C, Custom, mature)
• OpenSWE1R (C, C++, GPL-2.0, beta)
• OpenTESArena (C++, MIT, beta)
• OpenTitus (C, GPL-3.0, beta, inactive since 2014)
• OpenTomb (C, C++, Lua, LGPL-3.0, beta)
• OpenTriad (Java, GPL-3.0, beta, inactive since 2017)
• OpenTTD (C++, GPL-2.0, mature)
• OpenTyrian (C, GPL-2.0, beta, inactive since 2018)
• OpenVIII (C#, MIT, beta)
• OpenWebSoccer-Sim (PHP, LGPL-3.0, mature)
• OpenXcom (C++, GPL-3.0, mature)
• Operation Citadel (C++, GPL-2.0, beta, inactive since 2000)
• OPMon (C++, GPL-3.0, beta)
• Orbit-Hopper (C++, GPL-2.0, mature, inactive since 2019)
• Orbium (JavaScript, GPL-2.0, mature, inactive since 2018)
• ORIENT (C#, Java, GPL-2.0, mature, inactive since 2009)
• orona (CoffeeScript, GPL-2.0, beta, inactive since 2012)
• Orx (C, zlib, mature)
• Ostrich Riders (C++, GPL-3.0, beta)
• osu! (C#, MIT, beta)
• Other-Life (C, C++, Custom, beta)
• Our Personal Space (Ren'py, GPL-3.0, mature)
• Outer Space (Python, GPL-2.0, beta)
• Outpost HD (C++, 3-clause BSD, beta)
• ouzel (C, C++, Objective-C, 2-clause BSD, beta)
• pacman-canvas (JavaScript, CC-BY-SA-4.0, mature, inactive since 2018)
• PainTown (C++, Java, Python, 3-clause BSD, mature)
• Panda 3D (C++, C, 3-clause BSD, mature)
• Panel Attack (Lua, zlib, beta)
• Pang Zero (Perl, GPL-2.0, beta, inactive since 2007)
• Paper Isaac (ooc, MIT, beta, inactive since 2015)
• PARPG (Python, GPL-3.0, beta, inactive since 2012)
• PARSEC47 (D, 2-clause BSD, beta, inactive since 2003)
• Pasang Emas (Vala, GPL-3.0, mature)
• Pathological (Python, GPL-2.0, beta, inactive since 2003)
• Pax Britannica (Lua, C, MIT, mature)
• PCGen (Java, LGPL-2.1, mature)
• Pentagram (C++, GPL-2.0, beta, inactive since 2018)
• Penumbra (C#, MIT, mature)
• Performous (C, C++, GPL-2.0, mature)
• Phantasy Star Rebirth (C++, GPL-3.0, beta, inactive since 2013)
• Physics Platformer (Java, MIT, beta, inactive since 2017)
• Pingus (C++, GPL-3.0, mature)
• Pink Pony (C++, GPL-3.0, mature, inactive since 2017)
• Pioneer (C, C++, Lua, Apache-2.0, GPL-3.0, mature)
• Pioneers (C, GPL-2.0, mature)
• PixelLight (C, C++, MIT, mature, inactive since 2012)
• Pizza Business (C++, GPL-2.0, mature, inactive since 2003)
• pkg-config (C, GPL-2.0, mature)
• PlaneShift (C++, GPL-2.0, mature)
• Planetary Hoppers (Java, GPL-2.0, beta, inactive since 2003)
• PLIB (C++, LGPL-2.0, mature, inactive since 2012)
• PokerTH (C++, AGPL-3.0, mature, inactive since 2017)
• Polis (Java, GPL-3.0, mature, inactive since 2016)
• Polycode (C, C++, MIT, beta)
• POSTAL 1 Open Source (C++, GPL-2.0, beta, inactive since 2018)
• Powerslave EX (C, C++, GPL-3.0, beta, inactive since 2017)
• Powerslide remake (C++, MIT, beta)
• pq2 (C++, GPL-3.0, mature)
• PrBoom+ (C, GPL-2.0, mature, inactive since 2016)
• Prescription Wars (ColdFusion, JavaScript, GPL-3.0, mature, inactive since 2016)
• Privateer - Gemini Gold (C++, GPL-2.0, mature, inactive since 2012)
• Procedural Map Generator (C++, MIT, mature, inactive since 2018)
• progress-quest (C++, MIT, mature)
• Project Carrot (C++, MIT, beta, inactive since 2017)
• Project Dollhouse (C#, MPL-2.0, beta)
• Project Helena (Pascal, GPL-3.0, beta)
• ProQuake 4 (C, GPL-2.0, mature, inactive since 2018)
• proxx (TypeScript, JavaScript, Apache-2.0, mature)
• Psyco (C, MIT, mature, inactive since 2008)
• Pthreads-win32 (C, LGPL-2.1, mature)
• Pushover (C++, C, Lua, GPL-3.0, beta, inactive since 2018)
• PyBreak360 (Python, GPL-3.0, mature, inactive since 2015)
• pycraft (C, Python, GPL-2.0, mature, inactive since 2018)
• Pygame---Alien-Invasion (Python, GPL-3.0, beta, inactive since 2018)
• pygame (C, Python, LGPL-2.1, mature)
• PyKaraoke (Python, LGPL-2.1, beta, inactive since 2011)
• Pymapper (Python, GPL-3.0, mature)
• pyORPG (Python, MIT, beta, inactive since 2015)
• pyscroll (Python, LGPL-3.0, mature, inactive since 2018)
• pyskool (Python, GPL-3.0, mature)
• PySol (Python, GPL-2.0, mature, inactive since 2004)
• PyTMX (Python, LGPL-3.0, mature)
• Q-Gears (C, C++, GPL-2.0, beta, inactive since 2015)
• Qt (C++, LGPL-3.0, mature)
• Quad-engine (Pascal, MIT, beta)
• QuakeJS (JavaScript, MIT, mature)
• QuakeSpasm (C, GPL-2.0, mature)
• Quartz Engine (C++, 3-clause BSD, beta)
• Rabbit Escape (Java, GPL-2.0, mature)
• Race Into Space (C, C++, GPL-2.0, mature)
• RacerJS (JavaScript, MIT, mature, inactive since 2010)
• Radakan (Python, Custom, beta, inactive since 2014)
• Ragel (C++, MIT, mature)
• Rails: an 18xx game system (Java, GPL-2.0, mature)
• ransack (Python, MIT, mature, inactive since 2016)
• raylib (C, C++, zlib, mature)
• RBDOOM-3-BFG (C, C++, GPL-3.0, mature)
• Red Eclipse (C++, zlib, mature)
• Reflection Keen (C, Lua, GPL-2.0, mature)
• REGoth (C++, GPL-3.0, mature)
• Remixed Dungeon (Java, GPL-3.0, mature)
• ReQbert (JavaScript, GPL-3.0, beta)
• Rescue! Max (Java, GPL-3.0, beta, inactive since 2013)
• ReShade (C++, 3-clause BSD, mature)
• ResidualVM (C++, GPL-2.0, beta)
• Return of Dr. Destructo (C++, MIT, mature, inactive since 2015)
• Return to the Roots (C++, GPL-3.0, mature)
• rFXGen (C, zlib, mature)
• RickyD (C++, GPL-2.0, beta)
• Rigel Engine (C++, GPL-2.0, beta)
• Rigs of Rods (C, C++, AngelScript, GPL-3.0, mature)
• Riiablo (Java, Apache-2.0, beta)
• Rise of the Triad for Linux (C, GPL-2.0, mature, inactive since 2012)
• rock-raiders-remake (JavaScript, MIT, beta)
• Rockbot (C++, GPL-2.0, mature)
• Rocks'n'Diamonds (C, GPL-2.0, mature)
• Rogue Clone IV (C, 3-clause BSD, mature, inactive since 2006)
• Roguish (JavaScript, 3-clause BSD, beta, inactive since 2015)
• Rolemaster Office (Java, Apache-2.0, mature)
• Rolisteam (C++, JavaScript, GPL-2.0, mature)
• Room for Change (Java, Apache-2.0, mature, inactive since 2013)
• RPDungeon - computer aided role playing (Pascal, GPL-2.0, beta, inactive since 2006)
• RPG Paper Maker (C++, ?, mature)
• RPG-X (C, GPL-2.0, mature, inactive since 2015)
• rpgboss (Scala, JavaScript, AGPL-3.0, beta, inactive since 2017)
• rpge (C, GPL-3.0, beta, inactive since 2014)
• rRootage (C, 2-clause BSD, beta, inactive since 2004)
• RuneLite (Java, 2-clause BSD, mature)
• Ryzom Core (C++, AGPL-3.0, mature)
• S.C.O.U.R.G.E. (C++, GPL-2.0, beta, inactive since 2008)
• SanAndreasUnity (C#, MIT, mature)
• sandbox Game Maker (C++, C, Custom, mature, inactive since 2014)
• Scorched Moon (Python, GPL-3.0, beta)
• Scorched3D (C++, GPL-2.0, mature, inactive since 2014)
• Scrabble3D (Pascal, GPL-3.0, mature, inactive since 2015)
• Scrolling Game Development Kit 2 (C#, GPL-2.0, mature, inactive since 2017)
• ScummVM (C++, GPL-2.0, mature)
• SDL Asylum (C, GPL-3.0, mature, inactive since 2009)
• SDL Bomber (C, GPL-2.0, mature, inactive since 2012)
• SDL Game Engine 2D (C, MIT, beta, inactive since 2014)
• SDL Sopwith (C, GPL-2.0, mature, inactive since 2014)
• SDLPoP (C, GPL-3.0, mature)
• Secret Maryo Chronicles (C++, GPL-3.0, mature, inactive since 2009)
• Sengoku: Warring States of Japan (C++, Lua, MIT, beta, inactive since 2008)
• sensitive-js (JavaScript, ?, beta, inactive since 2017)
• Sentient Storage (Python, Public domain, mature)
• Settlers III remake (Java, MIT, beta)
• Seven Kingdoms: Ancient Adversaries (C++, GPL-2.0, mature)
• sfall (C++, C, GPL-3.0, mature)
• shadow-of-the-beast-html5 (JavaScript, Apache-2.0, beta, inactive since 2017)
• Shadowgrounds (C++, Custom-NC, beta, inactive since 2017)
• SharpKonquest (C#, GPL-2.0, mature, inactive since 2007)
• Shockolate (C, GPL-3.0, beta)
• Siege of Avalon : Open Source (Pascal, Custom, beta, inactive since 2011)
• SilverTree (C++, GPL-3.0, beta, inactive since 2007)
• Simitone (C#, MPL-2.0, beta)
• Simple and Fast Multimedia Library (C++, zlib, mature)
• Simple DirectMedia Layer (C, zlib, mature)
• Simple-Solitaire (Java, GPL-3.0, mature)
• Simutrans (C++, Artistic License, mature)
• Sine (C, C++, MIT, beta)
• Sintel The Game (Python, MIT, beta, inactive since 2014)
• Skifree-HTML5-clone (JavaScript, GPL-3.0, beta, inactive since 2011)
• skifree.js (JavaScript, MIT, mature, inactive since 2016)
• Skrupel - Tribute Compilation (PHP, JavaScript, GPL-2.0, mature, inactive since 2011)
• SLADE (C++, GPL-2.0, mature)
• SLASH'EM (C, R, C++, Custom, beta, inactive since 2007)
• Slay (Java, GPL-3.0, beta, inactive since 2010)
• Slime Volleyball (C++, 3-clause BSD, beta)
• Slot-Racers (C, GPL-3.0, mature, inactive since 2008)
• Sludge (C, C++, Objective-C, LGPL-2.1, mature)
• Smash Battle (C++, ?, beta, inactive since 2011)
• Smash (JavaScript, MIT, mature)
• snake (Java, WTFPL, mature, inactive since 2017)
• SoftPixel Engine (C++, zlib, mature, inactive since 2013)
• Solarus (C, C++, Lua, GPL-3.0, mature)
• SolarWolf (Python, LGPL-2.1, mature, inactive since 2004)
• Song of Albion (C, C++, Apache-2.0, mature, inactive since 2011)
• Sonic Robo Blast 2 (C, C++, GPL-2.0, mature)
• Sopwith 3 (C, C++, Objective-C, GPL-2.0, beta, inactive since 2003)
• Source of Tales (Lua, GPL-3.0, mature, inactive since 2013)
• Sourcehold (C++, MIT, beta)
• Space Faring (Java, GPL-3.0, beta)
• Space Harrier Clone (C, C++, MIT, beta, inactive since 2018)
• Space Nerds In Space (C, Lua, GPL-2.0, beta)
• Space Opera (Java, GPL-2.0, beta, inactive since 2008)
• Space Station 13 (DM, AGPL-3.0, mature)
• Space Trader for Windows (C#, GPL-2.0, mature, inactive since 2009)
• Space War (Java, Apache-2.0, mature)
• SpaceTrader for Java (Java, GPL-2.0, mature, inactive since 2010)
• SpaceZero (C, GPL-3.0, beta)
• Spartan Engine (C, C++, MIT, beta)
• Speed Dreams (C++, GPL-2.0, mature)
• Spice Trade (Java, LGPL-2.0, mature, inactive since 2005)
• splexhd (C++, GPL-2.0, beta, inactive since 2012)
• Spludlow Tetris (C#, GPL-3.0, mature, inactive since XX)
• Spooker Framework (C#, MIT, beta, inactive since 2014)
• Spring: 1944 (Lua, GPL-2.0, CC-BY-NC, mature)
• Spring (C++, C, Lua, GPL-2.0, mature)
• Squiffy (JavaScript, MIT, mature)
• SS13 Remake (C#, GPL-3.0, beta, inactive since 2015)
• Star Maiden Astraea Rio (Ren'py, CC-BY-NC, mature)
• Star Ruler 2 (C, C++, MIT, mature)
• star-control2 (C, C++, MIT, mature)
• Star-Wars-III (Python, GPL-2.0, mature, inactive since 2014)
• StarBlastrix (C++, GPL-2.0, beta, inactive since 2006)
• Stareater (C#, GPL-3.0, beta)
• Stargus (C++, Lua, GPL-2.0, beta, inactive since 2010)
• Stars! Nova (C#, GPL-2.0, beta)
• starshatter-open (C++, 3-clause BSD, beta, inactive since 2015)
• Stendhal (Java, GPL-2.0, mature)
• StepMania (C, C++, Lua, MIT, mature)
• Story of a Lost Sky (Python, 3-clause BSD, mature)
• Strife: Veteran Edition (C, C++, Objective-C, GPL-3.0, beta, inactive since 2016)
• Stunt Car Racer Remake (C++, BSD, beta, inactive since 2012)
• Stunt Rally (C, C++, GPL-3.0, mature)
• Summoning Wars (C, C++, Lua, GPL-3.0, beta, inactive since 2014)
• SunDog Resurrection (Java, Python, ?, beta)
• sundog (C, C++, Python, MIT, beta)
• Supaxl (JavaScript, ?, mature)
• Super Methane Brothers (C++, GPL-2.0, mature, inactive since 2011)
• Super Tilt Bro (Assembly, Python, WTFPL, mature)
• super-methane-brothers-gx (C++, GPL-2.0, beta, inactive since 2018)
• Supercars III (Java, ?, mature, inactive since 2014)
• SuperFoulEgg (Objective-C, C, MIT, mature, inactive since 2014)
• Superpowers (TypeScript, ISC, mature)
• SuperStarfighter (GDScript, MIT, beta)
• SuperTux (C++, GPL-3.0, beta)
• SuperTuxKart (C++, C, GPL-3.0, mature)
• SuperTuxParty (GDScript, GPL-3.0, beta)
• Supremacy (C#, Ms-RL, beta, inactive since 2014)
• Survivor (JavaScript, CC-BY-NC-3.0, mature)
• SWIG (C++, SWIG license, mature)
• SWP (C, C++, GPL-2.0, mature)
• Syndicate Wars Port (C, GPL-3.0, beta, inactive since 2010)
• T-Bots (C, GPL-2.0, beta, inactive since 2004)
• Taggem (JavaScript, AGPL-3.0, beta, inactive since 2014)
• Taisei Project (C, Python, MIT, mature)
• Tales of Maj'Eyal (C, Lua, GPL-3.0, mature)
• Tank: Zone of Death (C++, Lua, GPL-3.0, beta, inactive since 2017)
• Tanks of Freedom (GDScript, MIT, mature)
• Tapir (C, Ruby, Apache-2.0, MIT, beta, inactive since 2017)
• Tenes Empanadas Graciela (C, JavaScript, Perl, GPL-2.0, beta, inactive since 2015)
• Terasology (Java, Apache-2.0, mature)
• terrarium (C++, GPL-2.0, beta)
• TES3MP (C++, GPL-3.0, beta)
• TetraVex (Swift, GPL-3.0, beta)
• Tetris (in C and NCURSES) (C, 3-clause BSD, mature)
• The Battle for Wesnoth (C, C++, Java, Python, Lua, GPL-2.0, mature)
• The Bub's Brothers (Python, MIT, mature, inactive since 2013)
• The Butterfly Effect (C++, GPL-2.0, beta)
• The Castles of Dr. Creep (C++, Shell, GPL-3.0, mature)
• The Clans (C, GPL-2.0, beta, inactive since 2003)
• The Dark Mod (C++, GPL-3.0, mature)
• The Endless Dungeons (C, CC-BY-NC-SA-2.0, mature, inactive since 2015)
• The Epic of Heroes (C++, GPL-3.0, beta, inactive since 2015)
• The Eternity Engine (C, C++, GPL-3.0, mature)
• The hunt for the lost rainbow jewels (Jewelhunt) (Java, GPL-2.0, beta)
• The Legend of Edgar (C, GPL-2.0, mature)
• The Mana World (PHP, GPL-2.0, mature)
• The Powder Toy (C++, C, Lua, Python, GPL-3.0, mature)
• The Rush (C++, GPL-2.0, beta, inactive since 2011)
• The Secret Chronicles of Dr. M. (C++, GPL-3.0, mature)
• The Ur-Quan Masters (C, GPL-2.0, mature, inactive since 2011)
• The-Trail (Java, Apache-2.0, beta, inactive since 2018)
• Theme Park Builder 3D CAD (C++, GPL-3.0, beta, inactive since 2013)
• thiefcatcher (C++, GPL-3.0, beta)
• Thousand Parsec (C++, Python, GPL-2.0, beta, inactive since 2012)
• Thrive (C++, AngelScript, JavaScript, GPL-3.0, beta)
• Thrust (C, GPL-2.0, beta, inactive since 2006)
• Thunder Engine (C++, Apache-2.0, beta)
• Thyme (C, C++, GPL-2.0, beta)
• Tile World (C, GPL-2.0, mature, inactive since 2015)
• TinTin++ (C, GPL-3.0, mature)
• Tiny Wings (Objective-C, C, C++, MIT, beta)
• TOMB5 (C, C++, MIT, beta)
• Toppler (C++, GPL-2.0, mature, inactive since 2012)
• TORCS, The Open Racing Car Simulator (C++, GPL-2.0, mature, inactive since 2016)
• Torrega Race (Lua, GPL-3.0, mature, inactive since 2015)
• Total Annihilation 3D (C++, C, Lua, GPL-2.0, beta, inactive since 2017)
• TowerJumper (C++, GDScript, GPL-3.0, mature)
• Trackballs (C++, Scheme, GPL-2.0, mature)
• Train (Java, 3-clause BSD, beta)
• Transfusion (C, GPL-2.0, beta, inactive since 2007)
• Tremulous (C, GPL-2.0, mature, inactive since 2016)
• Tressette (C++, GPL-2.0, mature, inactive since 2017)
• Trinity Reign (C++, GPL-3.0, beta, inactive since 2013)
• TripleA (Java, GPL-2.0, mature)
• TROPHY (C++, GPL-2.0, mature, inactive since 2012)
• TrueCraft (C#, MIT, beta, inactive since 2018)
• TTDPatch (Assembly, C, C++, GPL-2.0, mature, inactive since 2013)
• Tumbly Towers (Java, MIT, beta, inactive since 2017)
• Tumiki Fighters (D, C++, 2-clause BSD, mature, inactive since 2005)
• Turious (C, GPL-3.0, beta, inactive since 2014)
• Turn of War (Java, GPL-3.0, beta, inactive since 2014)
• TurokEX (C++, C, GPL-2.0, beta, inactive since 2014)
• TUSSLE (Python, GPL-3.0, mature, inactive since 2017)
• Tux Football (C++, GPL-2.0, beta, inactive since 2012)
• Tux of Math Command (C, GPL-3.0, mature, inactive since 2011)
• Tux Racer (C, GPL-2.0, beta, inactive since 2001)
• Tuxemon (Python, GPL-3.0, mature)
• TVTower (BlitzMax, Lua, Custom, mature)
• twin-e (C, GPL-2.0, beta, inactive since 2015)
• Twine (JavaScript, GPL-3.0, mature)
• TwinEngine (C, GPL-2.0, mature, inactive since 2015)
• Tyrian Remake (Java, GPL-2.0, beta)
• TyrQuake (C, GPL-2.0, beta)
• UA_source (C++, GPL-2.0, beta)
• Uebergame (TorqueScript, C#, MIT, mature)
• UFO2000 (C, C++, Lua, GPL-2.0, mature, inactive since 2012)
• UFO: Alien Invasion (C, C++, GPL-2.0, mature)
• UlDunAd (Python, GPL-3.0, beta, inactive since 2011)
• Ultimate Stunts (C++, GPL-2.0, beta, inactive since 2013)
• UltraStar Deluxe (Pascal, GPL-2.0, mature)
• UltraStar (Pascal, ?, mature, inactive since 2010)
• uMario (C++, GPL-2.0, beta, inactive since 2016)
• Umbra (Python, Custom, beta, inactive since 2002)
• UnCiv (Kotlin, MPL-2.0, beta)
• Underworld Adventures (C++, Lua, GPL-2.0, beta)
• Undum (JavaScript, MIT, mature, inactive since 2018)
• uninvited (C, C++, Artistic License-2.0, beta, inactive since 2016)
• Unknown Horizons (Python, GPL-2.0, beta)
• UnNetHack (C, Custom, mature)
• Unvanquished (C, C++, GPL-3.0, mature)
• urde (C, C++, MIT, beta)
• Urho3D (C++, AngelScript, MIT, mature)
• Valyria Tear (Lua, C++, C, GPL-2.0, mature)
• Vamos (C++, Python, GPL-3.0, beta, inactive since 2014)
• VASSAL (Java, LGPL-2.1, mature)
• VCMI (C++, GPL-2.0, mature)
• VDrift (C++, GPL-3.0, mature, inactive since 2014)
• Vectoroids (C, GPL-2.0, mature, inactive since 2002)
• Vega Strike (C++, GPL-2.0, mature)
• Veloren (Rust, GPL-3.0, beta)
• Veraball (GDScript, MIT, beta, inactive since 2016)
• VGC (C++, Apache-2.0, beta)
• Violetland (C++, GPL-3.0, beta)
• Visual Pinball (C++, MAME, mature)
• vitetris (C, 2-clause BSD, beta)
• vkQuake (C, C++, GPL-2.0, mature)
• Vocaluxe (C#, C++, GPL-3.0, beta, inactive since 2018)
• Vortice (C#, MIT, mature)
• Vorton (C, GPL-3.0, beta, inactive since 2004)
• Voxelands (C++, GPL-3.0, beta)
• VQEngine (C++, GPL-3.0, beta)
• WallBall (Haxe, JavaScript, GPL-3.0, mature)
• War Of Kingdom (C, C++, GPL-2.0, beta)
• warcraft-remake (Java, GPL-2.0, beta)
• Wargamer (C++, GPL-2.0, mature, inactive since 2003)
• Wargus (C++, Lua, GPL-2.0, mature)
• Wario-Land-3 (Python, MIT, beta, inactive since 2018)
• WarMUX (C++, GPL-2.0, beta, inactive since XX)
• Warzone 2100 (C++, GPL-2.0, mature)
• Waste's Edge (Python, GPL-2.0, beta)
• WAtomic (Pascal, GPL-2.0, mature, inactive since 2005)
• WebChess (PHP, GPL-3.0, mature, inactive since 2010)
• WebFun (TypeScript, MIT, beta)
• Widelands (C, C++, Lua, Python, GPL-2.0, mature)
• Witch Blast (C++, GPL-3.0, beta, inactive since 2015)
• Wizardry Legacy (C++, GPL-3.0, beta, inactive since 2018)
• Wizards Magic (Python, GPL-2.0, mature, inactive since 2012)
• Wizznic! (C, GPL-3.0, beta, inactive since 2016)
• wkbre (C++, C, GPL-3.0, beta)
• Wolfpack Empire (C, GPL-3.0, mature)
• Word War vi (C, GPL-2.0, mature)
• World Builder (Visual Basic, GPL-2.0, mature, inactive since 2007)
• World of Heroes (Python, 3-clause BSD, beta, inactive since 2009)
• World of Phaos (PHP, GPL-2.0, mature, inactive since 2011)
• WorldForge (C++, GPL-2.0, mature)
• WWW (JavaScript, GPL-3.0, beta, inactive since 2014)
• wxWidgets (C++, Objective-C, Custom, mature)
• Wyrmsun (Lua, C++, GPL-2.0, mature)
• X-Force: Fight For Destiny (Pascal, GPL-2.0, beta, inactive since 2011)
• X-Moto (C++, GPL-2.0, mature, inactive since 2014)
• XArchon (C, C++, GPL-2.0, beta, inactive since 2003)
• xBaK (C++, GPL-3.0, beta, inactive since 2013)
• Xconq (C++, GPL-2.0, mature, inactive since 2005)
• xdigger (C, GPL-2.0, mature, inactive since 1999)
• xDuke (C, GPL-2.0, beta, inactive since 2010)
• Xenowar (C, C++, GPL-3.0, mature, inactive since 2014)
• XMage (Java, MIT, mature)
• Xonotic (C, GPL-3.0, mature)
• XorCurses (C, GPL-3.0, beta, inactive since 2012)
• xoreos (C++, GPL-3.0, beta)
• XPilot NG (C, GPL-2.0, mature, inactive since 2010)
• XPilot (C, GPL-2.0, mature, inactive since 2010)
• XScavenger (C, GPL-2.0, mature, inactive since 2015)
• XSera (C, Lua, MIT, beta, inactive since 2010)
• XSwing Plus (Java, GPL-3.0, beta, inactive since 2010)
• xu4 (C++, GPL-2.0, mature, inactive since 2016)
• XZ Utils (C, Custom, mature)
• Yamagi Quake II (C, GPL-2.0, mature)
• yaml-cpp (C++, MIT, mature)
• Yet Another Engine (MoonScript, Java, Lua, MIT, beta, inactive since 2016)
• Yo Frankie! (Blender Script, ?, mature, inactive since 2009)
• YSoccer (Java, GPL-2.0, mature)
• ZAngband (C, Custom, mature, inactive since 2005)
• Zatacka X (C, GPL-3.0, beta)
• Zaz (C++, GPL-3.0, beta, inactive since 2010)
• ZDoom (C, C++, ZenScript, GPL-3.0, mature)
• Zed Online (C++, ?, mature)
• Zelda Classic (C, C++, GPL-3.0, mature)
• Zelda: Mystery of Solarus DX (Lua, GPL-3.0, mature)
• Zero Ballistics (C++, MIT, mature, inactive since 2013)
• Zero-K (Lua, GPL-2.0, mature)
• Zetawar (Clojure, MIT, mature)
• ZGameEditor (Pascal, MIT, mature)
• zlib (C, zlib, mature)
• Zod Engine (C++, ?, mature, inactive since 2018)
• Zone of Control (Rust, Apache-2.0, beta, inactive since 2017)
• zorkClone (Java, Apache-2.0, beta)