All

0 A.D. (C, C++, GPL-2.0, beta)
1oom (C, GPL-2.0, mature)
2048 (JavaScript, MIT, mature)
3d.city (JavaScript, GPL-3.0, mature, inactive since 2016)
4D-TRIS (C, GPL-2.0, mature, inactive since 2012)
A Planet's Revenge (Python, GPL-3.0, beta, inactive since 2008)
Abuse (C++, Lisp, Public domain, GPL-2.0, WTFPL, mature, inactive since 2011)
Achtung, die Kurve! (JavaScript, AGPL-3.0, mature)
AdaVenture (Ada, GPL-3.0, mature)
Advanced Strategic Command (C++, GPL-2.0, mature)
Afternoon Stalker (C++, GPL-2.0, mature, inactive since 2012)
AI Wars (Python, MIT, beta, inactive since 2010)
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)
Alien Assault Traders (PHP, GPL-2.0, beta, inactive since 2009)
alive (C++, MIT, beta, inactive since 2017)
Allegro (C, zlib, mature)
Ancient Beast (JavaScript, AGPL-3.0, mature)
Andor's Trail (Java, GPL-2.0, beta)
Angband (C, GPL-2.0, mature)
Annchienta (C++, GPL-3.0, mature, inactive since 2009)
Antares (C++, LGPL-3.0, beta)
AntiChess (Java, MIT, mature, inactive since 2003)
aquastax (JavaScript, MIT, beta)
Arashi-JS (JavaScript, GPL-2.0, beta, inactive since 2010)
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)
AstroMenace (C++, C, GPL-3.0, mature)
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)
AutoREALM (C++, GPL-3.0, mature)
Avanor (C++, Lua, GPL-2.0, beta, inactive since 2008)
Ball And Wall (JavaScript, MIT, mature, inactive since 2015)
Ballerburg SDL (C, GPL3, mature)
Barony (C++, GPL-3.0, mature)
Batrachians (C++, GPL-2.0, beta, inactive since 2012)
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)
Betrayer's Moon Tactics (JavaScript, GPL-2.0, beta, inactive since 2006)
Biniax (C, zlib, mature, inactive since 2012)
Birth of the Empires (C++, Custom, mature, inactive since 2016)
BitRiot (C++, Apache-2.0, beta, inactive since 2017)
BlackNova Traders (PHP, JavaScript, GPL-2.0, beta, inactive since 2012)
BlakedAwesomenaughts (JavaScript, PHP, MIT, beta, inactive since 2015)
Blender game engine (C++, GPL-2.0, mature)
Blitzkrieg (Java, GPL-3.0, beta, inactive since 2012)
Blobby Volley 2 (C++, GPL-2.0, mature, inactive since 2017)
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)
Bombermaaan (C++, GPL-3.0, mature, inactive since 2010)
Bombic2 (C++, GPL-2.0, beta, inactive since 2010)
Bombic (C++, GPL-2.0, beta, inactive since 2005)
Bombman (Python, CC0, mature)
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)
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)
BRIQUOLO (C++, GPL-3.0, mature, inactive since 2008)
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)
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)
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)
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)
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)
cc94 (C++, Python, AGPL-3.0, beta)
CCCP (C++, AGPL-3.0, beta)
Celestron (Python, GPL-3.0, beta, inactive since 2012)
chainreaction (Java, LGPL-3.0, mature, inactive since 2017)
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)
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)
CivOne (C#, CC0, beta)
Classic Blades of Exile (C++, GPL-2.0, 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)
Commander Genius (C, C++, GPL-2.0, mature)
CommandoJS (JavaScript, CoffeeScript, MIT, beta, inactive since 2012)
Conquests (C++, GPL-2.0, mature, inactive since 2012)
Core War (C, Java, GPL-2.0, 2-clause BSD, mature)
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)
Crimson Fields (C++, GPL-2.0, mature, inactive since 2010)
Crossfire (C, Java, GPL-2.0, mature)
Crown and Cutlass (C++, Custom, beta, inactive since 2009)
Crypto++ (C++, Boost-1.0, mature)
CrystalQuest (JavaScript, MIT, mature, inactive since 2017)
Cubosphere (C, C++, GPL-3.0, beta)
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)
Deathchase 3D (C, GPL-2.0, mature, inactive since 2002)
Decker (Java, GPL-2.0, beta, inactive since 2013)
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)
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)
DNT (C++, GPL-3.0, beta, inactive since 2016)
Domination (Java, GPL-3.0, mature)
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)
Doomsday (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)
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)
Dust Racing 2D (C, C++, GPL-3.0, 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)
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)
ET: Legacy (C, C++, Lua, GPL-3.0, mature)
Eternal Lands (C, C++, Custom, mature)
EternalWinterWars (Java, MIT, beta, inactive since 2014)
Evil Cult (Haxe, JavaScript, GPL-3.0, mature)
Evol Online (C, GPL-3.0, mature)
Executive Man (JavaScript, Custom, mature, inactive since 2017)
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)
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)
Fanwor (C, GPL-2.0, mature)
FAR Colony (Pascal, GPL-3.0, beta, inactive since 2014)
First Strike (Java, MIT, mature)
Fish Fillets - Next Generation (C++, GPL-2.0, mature)
Flare (C++, Java, GPL-3.0, mature)
FlightGear (C++, GPL-2.0, mature)
Flixel (ActionScript, MIT, mature)
Fluid Table Tennis (JavaScript, MIT, mature, inactive since 2013)
fonline (C, C++, GPL-3.0, beta)
FQuake3 (F#, GPL-2.0, beta, inactive since 2014)
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)
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 WebGL (JavaScript, Java, 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)
GameLV (C++, GPL-2.0, beta)
Gang Garrison 2 (Game Maker Script, MPL, mature)
GDash (C++, MIT, beta)
GearHead (Pascal, LGPL-2.1, Apache-2.0, mature)
Gee Whiz (C, GPL-2.0, beta, inactive since 2004)
GemRB (C++, Python, GPL-2.0, mature)
ges-code (C, C++, GPL-3.0, mature)
Gift Grabber (JavaScript, Apache-2.0, mature)
Gigalomania (C++, GPL-2.0, mature)
Glest (C++, GPL-2.0, mature, inactive since 2009)
Globulation 2 (C++, 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)
Gnomescroll (C, C++, Python, GPL-3.0, beta, inactive since 2013)
GNU FreeDink (C, C++, GPL-3.0, mature)
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)
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)
GPL Arcade Volleyball (C++, GPL-2.0, beta, inactive since 2006)
Grabble (Java, ?, mature, inactive since 2006)
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)
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)
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)
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)
HexGL (JavaScript, CoffeeScript, MIT, mature, inactive since 2016)
Hexoshi (Python, GPL-3.0, beta, inactive since 2016)
Hextris (JavaScript, GPL-3.0, mature)
Hexwar (Ruby, JavaScript, MIT, beta, inactive since 2012)
Hocoslamfy (C, C++, GPL-2.0, beta, inactive since 2016)
HoDoKu (Java, GPL-3.0, mature, inactive since 2013)
HolySpirit (C++, GPL-3.0, beta, inactive since 2013)
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)
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)
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)
IO Reboot (C#, MIT, mature, inactive since 2017)
ioquake3 (C, GPL-2.0, 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)
JaNaG - Java Name Generator (Java, GPL-3.0, mature, inactive since 2016)
javascript-E.T. (JavaScript, Assembly, MIT, beta, inactive since 2017)
Jazz² Resurrection (C#, JavaScript, GPL-3.0, mature)
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)
Julius (C, C++, AGPL-3.0, mature)
Jump'n'Bump (C, GPL-2.0, mature, inactive since 2004)
KaM Remake (Pascal, AGPL-3.0, mature)
KAtomic (C++, GPL-2.0, mature)
Keen Dreams (C, Assembly, C++, GPL-2.0, mature, inactive since 2014)
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)
KnightOfWor (Java, GPL-3.0, beta, inactive since 2015)
Knights (C++, GPL-3.0, beta, inactive since 2014)
Kobold's Quest 2 (Python, LGPL-3.0, beta, inactive since 2011)
KQ Lives (C, GPL-2.0, beta, inactive since 2011)
Krystal Drop (C++, GPL-2.0, beta, inactive since 2004)
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)
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)
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)
Librelancer (C, C#, MIT, beta)
Libxml2 (C, MIT, mature)
Lightweight Java Game Library (Kotlin, C, 3-clause BSD, 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)
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)
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)
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, CC-BY-NC-SA-3.0, mature, inactive since 2012)
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)
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++, GPL-2.0, beta, inactive since 2005)
MicroWar 2.0 (Python, 3-clause BSD, mature, inactive since 2009)
MineCraft-One-Week-Challenge (C++, MIT, beta)
Minesweeper.Zone (JavaScript, PHP, MIT, mature)
Minetest (C, C++, Lua, LGPL-2.1, 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, GPL-3.0, 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)
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)
NStars! (C#, GPL-2.0, 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 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++, GPL-3.0, 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)
OpenBlok (C++, GPL-3.0, beta)
OpenBlox (Python, Lua, GPL-3.0, beta, inactive since 2011)
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)
OpenHoMM (C++, GPL-3.0, beta, inactive since 2010)
OpenJazz (C++, GPL-2.0, beta)
OpenJK (C, C++, GPL-2.0, 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++, GPL-2.0, beta, inactive since 2006)
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)
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)
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)
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)
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)
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)
Pasang Emas (Vala, GPL-3.0, mature)
Pax Britannica (Lua, C, MIT, mature)
PCGen (Java, LGPL-2.1, mature)
Phantasy Star Rebirth (C++, GPL-3.0, beta, inactive since 2013)
Pingus (C++, GPL-3.0, mature)
Pioneer (C, C++, Lua, Apache-2.0, GPL-3.0, mature)
Pioneers (C, GPL-2.0, mature)
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)
PokerTH (C++, AGPL-3.0, mature, inactive since 2017)
Polis (Java, GPL-3.0, mature, inactive since 2016)
Polycode (C, C++, MIT, beta)
Project Helena (Pascal, GPL-3.0, beta)
Pthreads-win32 (C, LGPL-2.1, mature)
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)
PySol (Python, GPL-2.0, mature, inactive since 2004)
Qt (C++, LGPL-3.0, mature)
Quad-engine (Pascal, MIT, beta)
Rabbit Escape (Java, GPL-2.0, mature)
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)
Red Eclipse (C++, zlib, mature)
REGoth (C++, GPL-3.0, mature)
Return to the Roots (C++, GPL-3.0, mature)
Rigs of Rods (C, C++, AngelScript, GPL-3.0, 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)
rpge (C, GPL-3.0, beta, inactive since 2014)
Ryzom Core (C++, AGPL-3.0, mature)
S.C.O.U.R.G.E. (C++, GPL-2.0, beta, inactive since 2008)
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 Game Engine 2D (C, MIT, beta, inactive since 2014)
SDL Sopwith (C, GPL-2.0, mature, inactive since 2014)
Secret Maryo Chronicles (C++, GPL-3.0, mature, inactive since 2009)
Sengoku: Warring States of Japan (C++, Lua, MIT, beta, inactive since 2008)
Sentient Storage (Python, Public domain, mature)
Settlers III remake (Java, MIT, beta)
Seven Kingdoms: Ancient Adversaries (C++, GPL-2.0, mature)
SharpKonquest (C#, GPL-2.0, mature, inactive since 2007)
SilverTree (C++, GPL-3.0, beta, inactive since 2007)
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)
Sintel The Game (Python, MIT, beta, inactive since 2014)
Skrupel - Tribute Compilation (PHP, JavaScript, GPL-2.0, mature, inactive since 2011)
SLASH'EM (C, Custom, beta, inactive since 2007)
Slay (Java, GPL-3.0, beta, inactive since 2010)
Smash Battle (C++, ?, beta, inactive since 2011)
Smash (JavaScript, MIT, mature)
SoftPixel Engine (C++, zlib, mature, inactive since 2013)
Solarus (C, C++, Lua, GPL-3.0, mature)
Song of Albion (C, C++, Apache-2.0, mature, inactive since 2011)
Source of Tales (Lua, GPL-3.0, mature, inactive since 2013)
Space Faring (Java, GPL-3.0, 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)
Speed Dreams (C++, GPL-2.0, mature)
Spice Trade (Java, LGPL-2.0, mature, inactive since 2005)
Spring RTS engine (C++, C, Lua, GPL-2.0, mature)
Star Control II: The Ur-Quan Masters (C, GPL-2.0, mature, inactive since 2011)
Star Maiden Astraea Rio (Ren'py, CC-BY-NC, mature)
Star Ruler 2 (C, C++, MIT, mature)
StarBlastrix (C++, GPL-2.0, beta, inactive since 2006)
Stareater (C#, GPL-3.0, beta)
Stars! Nova (C#, GPL-2.0, beta)
Stendhal (Java, GPL-2.0, mature)
StepMania (C, C++, Lua, MIT, mature)
Story of a Lost Sky (Python, 3-clause BSD, mature)
Stunt Rally (C, C++, GPL-3.0, mature)
Summoning Wars (C, C++, Lua, GPL-3.0, beta, inactive since 2014)
Superpowers (TypeScript, ISC, mature)
SuperTuxKart (C++, C, GPL-3.0, mature)
Supremacy (C#, Ms-RL, beta, inactive since 2014)
SWIG (C++, SWIG license, mature)
T-Bots (C, GPL-2.0, beta, inactive since 2004)
Tales of Maj'Eyal (C, Lua, GPL-3.0, mature)
Tanks of Freedom (GDScript, MIT, mature)
Tenes Empanadas Graciela (C, JavaScript, Perl, GPL-2.0, beta, inactive since 2015)
Terasology (Java, Apache-2.0, mature)
TetraVex (Swift, GPL-3.0, beta)
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 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)
Thousand Parsec (C++, Python, GPL-2.0, beta, inactive since 2012)
TinTin++ (C, GPL-3.0, mature)
TORCS, The Open Racing Car Simulator (C++, GPL-2.0, mature, inactive since 2016)
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)
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)
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)
TwinEngine (C, GPL-2.0, mature, inactive since 2015)
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)
UltraStar Deluxe (Pascal, GPL-2.0, mature)
UltraStar (Pascal, ?, mature, inactive since 2010)
Umbra (Python, Custom, beta, inactive since 2002)
Underworld Adventures (C++, Lua, GPL-2.0, beta, inactive since 2007)
Unknown Horizons (Python, GPL-2.0, beta)
UnNetHack (C, Custom, mature)
Unvanquished (C, C++, GPL-3.0, mature)
Urho3D (C++, AngelScript, MIT, mature)
Valyria Tear (Lua, C++, C, GPL-2.0, mature)
VASSAL Engine (Java, LGPL-2.1, mature)
VCMI Project (C++, GPL-2.0, mature)
VDrift (C++, GPL-3.0, mature, inactive since 2014)
Vega Strike (C++, GPL-2.0, mature)
Veloren (Rust, GPL-3.0, beta)
War Of Kingdom (C, C++, GPL-2.0, beta)
Wargamer (C++, GPL-2.0, mature, inactive since 2003)
Wargus (C++, Lua, GPL-2.0, mature)
Warzone 2100 (C++, GPL-2.0, mature)
Waste's Edge (Python, GPL-2.0, beta)
WAtomic (Pascal, GPL-2.0, mature, inactive since 2005)
Widelands (C, C++, Lua, Python, GPL-2.0, mature)
Witch Blast (C++, GPL-3.0, beta, inactive since 2015)
Wizards Magic (Python, GPL-2.0, mature, inactive since 2012)
Wolfpack Empire (C, GPL-3.0, 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)
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)
Xconq (C++, GPL-2.0, mature, inactive since 2005)
xdigger (C, GPL-2.0, mature, inactive since 1999)
Xenowar (C, C++, GPL-3.0, mature, inactive since 2014)
Xonotic (C, GPL-3.0, mature)
xoreos (C++, GPL-3.0, beta)
XPilot (C, GPL-2.0, mature, inactive since 2010)
XSera (C, Lua, MIT, beta, inactive since 2010)
xu4 (C++, GPL-2.0, mature, inactive since 2016)
XZ Utils (C, Custom, mature)
yaml-cpp (C++, MIT, mature)
Yo Frankie! (Blender Script, ?, mature, inactive since 2009)
YSoccer (Java, GPL-2.0, mature)
ZAngband (C, Custom, mature, inactive since 2005)
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)
Zone of Control (Rust, Apache-2.0, beta, inactive since 2017)

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