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, 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)
Land of Fire (Custom, GPL-2.0, beta)
LastTry (Java, MIT, beta, inactive since 2017)
Lemmings.ts (TypeScript, MIT, mature)
Lemmini (Java, Apache-2.0, beta, inactive since 2017)
Lexica (Java, GPL-3.0, mature)
LGames (C++, GPL-2.0, mature)
LGeneral (C, GPL-2.0, mature, inactive since 2017)
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)
Lightweight Java Game Library (Kotlin, C, 3-clause BSD, mature)
LIKO-12 (Lua, MIT, mature)
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)
lttp-phaser (TypeScript, JavaScript, MIT, beta, inactive since 2016)
Lua (C, MIT, mature)
Lugaru (C++, GPL-2.0, mature)
Lumix Engine (C++, MIT, beta)
LZMA SDK (C, LGPL-2.0, mature)
LÖVE (C++, zlib, mature)
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)
Magical Life (C#, MIT, beta)
Mana (C++, GPL-2.0, beta)
Manic Digger (C#, Public domain, Unlicense, mature, inactive since 2017)
Maratis (C++, GPL-2.0, beta)
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 (C, C++, Lua, LGPL-2.1, mature)
mini2Dx (Java, C#, Apache-2.0, mature)
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)
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)
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.Boom (C++, MIT, mature)
Murder In The Public Domain (C++, GPL-3.0, mature, inactive since 2013)
Naev (C, Lua, GPL-3.0, mature)
Nazara Engine (C, C++, MIT, beta)
NBlood (C, C++, Lua, GPL-2.0, mature)
Netacka (C, MIT, mature)
NetHack (C, Custom, mature)
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)
NLarn (C, Lua, GPL-3.0, mature)
Noiz2sa (C, C++, 2-clause BSD, beta, inactive since 2004)
NOVA PINBALL (Lua, GPL-3.0, beta, inactive since 2017)
NStars! (C#, ?, beta, inactive since 2004)
NullpoMino (Java, 3-clause BSD, mature)
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)
Omnispeak (C, GPL-2.0, 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)
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, inactive since 2007)
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)

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