All

0 A.D. (C, C++, GPL-2.0, beta)
2048 (Javascript, MIT, mature)
3d.city (JavaScript, GPL-3.0, mature, inactive since 2016)
A Planet's Revenge (Python, GPL-3.0, beta, inactive since 2008)
AI Wars (Python, MIT, beta, inactive since 2010)
AdaVenture (Ada, GPL-3.0, mature)
Advanced Strategic Command (C++, GPL-2.0, mature)
Aeron (C++, ?, mature, inactive since 2011)
Aleph One: Marathon (C++, Lua, GPL-3.0, mature, inactive since 2015)
Alien Assault Traders (PHP, GPL-2.0, beta, inactive since 2009)
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)
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)
Arx Libertatis (C++, GPL-3.0, mature)
Astromenace (C++, C, GPL-3.0, mature)
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)
BZFlag (C++, LGPL-2.1, MPL-2.0, mature)
Ballerburg (C, Public Domain, mature, inactive since 1987)
Battle Tanks (C++, GPL-2.0, mature, inactive since 2009)
Battle for Wesnoth (C++, GPL-2.0, mature)
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)
BlackNova Traders (PHP, JavaScript, GPL-2.0, beta, inactive since 2012)
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, inactive since 2015)
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)
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, mature, inactive since 2011)
BrowserQuest (JavaScript, MPL-2.0, mature)
Brutal Chess (C++, GPL-2.0, beta, inactive since 2007)
Bygfoot (Java, GPL-2.0, beta)
C-Dogs (C, GPL-2.0, mature)
C-evo (Pascal, Public Domain, GPL-3.0, mature, inactive since 2013)
COCOS2D-X (C++, MIT, mature)
Cabbages and Kings (Python, MIT, mature)
Caesar IA (C++, GPL-3.0, beta)
Call to Power 2 (C++, Custom, mature)
Candy Box 2 (Typescript, Javascript, GPL-3.0, mature, inactive since 2013)
Cart Life (AGS Script, Custom, mature, inactive since 2014)
Castle Game Engine (Pascal, LGPL-2.0, mature)
Castle of the Winds (JavaScript, MIT, beta)
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)
Catch Challenger (C++, GPL-3.0, mature)
Celestron (Python, GPL-3.0, beta, inactive since 2012)
Childsplay (Python, GPL-3.0, mature)
Chocolate Doom (C, GPL-2.0, mature)
Choria (C++, C, Lua, GPL-3.0, mature)
Chromium B.S.U. (C++, Artistic License, mature)
CivOne (C#, CC0, beta)
Civil (Python, GPL-2.0, beta, inactive since 2003)
Classic Blades of Exile (C++, GPL-2.0, mature)
Clou! (C, Custom, beta)
Colobot (C++, GPL-3.0, mature)
Colonization too (C++, GPL-2.0, beta, inactive since 2004)
Colossal Cave Adventure (Python, Apache-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)
Corsix Theme Hospital (Lua, C++, MIT, mature)
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)
D-Fend Reloaded (Pascal, GPL-3.0, mature, inactive since 2015)
DNT (C++, GPL-3.0, beta, inactive since 2016)
DRL (Lua, Pascal, GPL-2.0, 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)
Dash Engine (D, MIT, mature, inactive since 2015)
Dawn (C++, GPL-3.0, beta, inactive since 2011)
DeSmuME (C, C++, GPL-2.0, mature, inactive since 2015)
Decker (Java, GPL-2.0, beta, inactive since 2013)
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)
DemiGod (Java, GPL-3.0, beta, inactive since 2013)
Devana (PHP, zlib, beta)
Digital: A Love Story (Ren'py, CC-BY-NC-SA, mature)
Domination (Java, GPL-3.0, mature)
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)
Duel Commander (C, GPL-3.0, beta, inactive since 2009)
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)
ENIGMA (C++, C, GPL-3.0, mature)
EPOH (JavaScript, MIT, beta)
EasyRPG Player (C++, GPL-3.0, mature)
Eat The Whistle (C, ?, mature, inactive since 2017)
Egoboo (C++, C, GPL-3.0, mature, inactive since 2015)
Endgame: Singularity (Python, GPL-2.0, beta)
Endless Sky (C++, GPL-3.0, mature)
Enigma (C, C++, GPL-2.0, mature)
Eos, Dawn of Light: A Space Opera (Python, MIT, beta, inactive since 2007)
Epiar (C, C++, Lua, GPL-2.0, beta)
Erebus (C++, GPL-3.0, beta)
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)
Exult (C++, GPL-2.0, mature)
FAR Colony (Pascal, GPL-3.0, beta, inactive since 2014)
Fall of Imyrin (C++, Python, GPL-3.0, beta, inactive since 2009)
Fallen Spire (Python, GPL-3.0, beta, inactive since 2009)
Fanwor (C, GPL-2.0, mature)
First Strike (Java, MIT, mature)
Fish Fillets - Next Generation (C++, GPL-2.0, mature, inactive since 2014)
Flare Engine (C++, GPL-3.0, mature)
FlightGear (C++, GPL-2.0, mature)
Flixel (ActionScript, MIT, mature)
Free Mars (Java, GPL-3.0, mature)
Free Orion (C++, Python, GPL-2.0, beta)
Free Space Colonization (C, GPL-2.0, beta)
Free heroes2 engine (C++, GPL-2.0, beta, inactive since 2015)
Free in the Dark (engine) (C, C++, GPL-2.0, beta)
FreeCol (Java, GPL-2.0, mature)
FreeLords (Java, GPL-2.0, beta)
FreeRCT (C++, GPL-2.0, beta, inactive since 2016)
FreeRails (Java, GPL-2.0, beta)
FreeSynd (C++, GPL-2.0, beta)
FreeTrain (C#, LGPL-2.1, beta, inactive since 2009)
FreeType (C, GPL, mature)
Freeciv WebGL (JavaScript, Java, AGPL-3.0, mature)
Freeciv (C, GPL-2.0, mature)
Freedink (C++, GPL-3.0, mature)
Freedoom (Not applicable, Not applicable, beta)
FreedroidRPG (C, GPL-2.0, mature)
Freeminer (C++, Lua, GPL-3.0, beta)
Freeserf (C++, GPL-3.0, beta)
Freestars (C++, GPL-2.0, beta, inactive since 2008)
Frozen Bubble (Perl, GPL-2.0, mature, inactive since 2012)
Fujo (Python, CC-BY-SA-4.0, mature, inactive since 2014)
GDash (C++, MIT, beta)
GLtron (C, GPL, beta, inactive since 2017)
GM Tools (C++, GPL-2.0, beta, inactive since 2004)
GPL Arcade Volleyball (C++, GPL-2.0, beta, inactive since 2006)
GUSANOS (?, ?, beta, inactive since 2006)
GalaxyMage Redux (Python, GPL-2.0, beta, inactive since 2011)
GalaxyNG (C, GPL-2.0, mature, inactive since 2005)
GameLV (C++, GPL, beta)
Gang Garrison 2 (Game Maker Script, MPL, mature)
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)
Gigalomania (C++, GPL-2.0, mature)
Glest (C++, GPL-2.0, mature, inactive since 2009)
Globulation2 (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)
Grabble (Java, ?, mature, inactive since 2006)
Greenius' Civil War (C++, GPL-2.0, beta, inactive since 2001)
Grobots (C++, GPL-2.0, mature, inactive since 2014)
H-World (C, Lua, GPL-2.0, beta, inactive since 2005)
Hale (Java, GPL-2.0, beta, inactive since 2014)
HarfBuzz (C++, MIT, mature)
Harris (C, Python, GPL-3.0, beta)
HaxeFlixel (Haxe, MIT, mature)
Haxima (C++, GPL-3.0, 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)
Hexwar (Ruby, JavaScript, MIT, beta, inactive since 2012)
HoDoKu (Java, GPL-3.0, mature, inactive since 2013)
HolySpirit (C++, GPL-3.0, beta, inactive since 2013)
HyperRogue (C++, GPL-2.0, mature)
Ilarion (C++, Java, Lua, GPL-3.0, mature)
Imperium (?, ?, mature)
Infiniminer (C#, MIT, mature, inactive since 2016)
Irrlicht Engine (C++, C, zlib, mature)
Isometric Turn-Based Strategy (Python, MIT, beta)
Iter Vehemens ad Necem (C++, GPL-2.0, beta)
JQuest (Java, GPL-2.0, beta, inactive since 2006)
JSettlers (Java, GPL-3.0, mature)
JaNaG - Java Name Generator (Java, GPL-3.0, mature, inactive since 2016)
Jagged Alliance 2 Stracciatella (C++, Custom, mature)
JiGS Interactive Game System (JavaScript, PHP, GPL-3.0, beta)
KAtomic (C++, GPL-2.0, mature)
KQ Lives (C, GPL-2.0, beta, inactive since 2011)
Kingdoms (C++, GPL-3.0, beta, inactive since 2014)
Knights and Merchants Remake (Pascal, AGPL-3.0, mature)
Kobold's Quest 2 (Python, LGPL-3.0, beta, inactive since 2011)
LGames (C++, GPL-2.0, mature)
LGeneral (C, GPL-2.0, mature)
LZMA SDK (C, LGPL-2.0, mature)
Labyrinth of Worlds (C++, LGPL-3.0, beta, inactive since 2010)
Land of Fire (Custom, GPL-2.0, beta)
Libxml2 (C, MIT, mature)
Lightweight Java Game Library (Kotlin, C, 3-clause BSD, mature)
LinCity-NG (C++, GPL, 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)
Lips of Suna (C, GPL-3.0, beta, inactive since 2014)
Liquid War (C, GPL-3.0, mature, inactive since 2015)
LordsAWar! (C++, GPL-3.0, mature)
Lua (C, MIT, mature)
Lugaru (C++, GPL-2.0, mature)
Lumix Engine (C++, MIT, beta)
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++, GPL-2.0, mature, inactive since 2002)
Magarena (Java, Groovy, GPL-3.0, mature)
Mana (C++, GPL-2.0, beta)
Maratis (C++, GPL-2.0, beta)
Mars, Land of No Mercy (C++, GPL-2.0, beta, inactive since 2008)
Me and My Shadow (C++, GPL-3.0, beta)
MechCommander 2 Omnitech (C++, MPL, beta, inactive since 2013)
Mechanized Assault & eXploration Reloaded (C++, C, GPL-2.0, beta, inactive since 2016)
Mega Mario (C++, LGPL-2.1, mature, inactive since 2012)
MegaGlest (C++, GPL-2.0, 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)
MicroWar 2.0 (Python, 3-clause BSD, mature, inactive since 2009)
Micropolis (C++, Java, Python, GPL-3.0, mature)
Minetest (C++, Lua, LGPL-2.1, mature)
MonoGame (C#, MPL, MIT, mature)
Monster Generator (Java, MIT, mature)
Monstrosity (Python, MIT, mature)
Moria (C, GPL-3.0, mature)
Mpango (Java, GPL-2.0, beta, inactive since 2013)
Murder In The Public Domain (C++, GPL-3.0, mature, inactive since 2013)
NLarn (C, Lua, GPL-3.0, mature)
Naev (C, Lua, GPL-3.0, mature)
NetHack (C, Custom, mature)
NetPanzer (C++, GPL-2.0, beta)
NetStatsBaseball (C, ?, mature)
Netrek (?, ?, mature, inactive since 2009)
Neverball (C, GPL-2.0, mature)
Nexiuz (C++, GPL-2.0, mature)
O.H.R.RPG.C.E (Basic, GPL-2.0, mature)
OGRE3D (C++, MIT, mature)
ORIENT (C#, Java, GPL-2.0, mature, inactive since 2009)
Octaforge (C++, Custom, mature)
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 Dune (C, GPL-2.0, mature)
Open Game Engine (C++, LGPL-2.1, beta, inactive since 2008)
Open Imperium Galactica (Java, GPL-3.0, beta)
Open Legend RPG (Text, Custom, mature)
Open Meridian (C, C++, GPL-2.0, mature)
Open Panzer (JavaScript, GPL-2.0, mature)
Open RPG Maker (C++, GPL-3.0, beta, inactive since 2014)
Open RSC (Java, GPL-3.0, mature)
Open Rails (C#, GPL-3.0, mature)
Open Soccer Star (PHP, GPL-3.0, beta)
Open Surge (C, GPL-3.0, beta)
Open Tibia (C++, GPL-2.0, beta, inactive since 2014)
Open Yahtzee (C++, GPL-2.0, mature, inactive since 2016)
Open Zelda (C++, zlib, beta)
OpenArena (C, GPL-2.0, mature, inactive since 2012)
OpenBlox (Python, Lua, GPL-3.0, beta, inactive since 2011)
OpenCity (C++, GPL-2.0, beta)
OpenClonk (C, C++, ISC, mature)
OpenFL (Haxe, MIT, mature)
OpenHoMM (C++, GPL-3.0, beta, inactive since 2010)
OpenLieroX (C++, LGPL, mature)
OpenMOO2 (Python, GPL-2.0, beta, inactive since 2011)
OpenMW (C++, GPL-3.0, mature)
OpenRA (C#, GPL-3.0, mature)
OpenRCT2 (C++, GPL-3.0, beta)
OpenRPG (Python, GPL-2.0, mature, inactive since 2013)
OpenSSL (C, Custom, mature)
OpenSkyscraper (C++, GPL-2.0, beta)
OpenSoccer (PHP, GPL-3.0, beta)
OpenTTD (C++, GPL-2.0, mature)
OpenWebSoccer-Sim (PHP, LGPL-3.0, mature)
OpenXcom (C++, GPL-3.0, mature)
Openglad (C++, GPL-2.0, mature, inactive since 2004)
Operation Citadel (C++, GPL-2.0, beta, inactive since 2000)
Orx (C, zlib, mature)
Other-Life (C, C++, Custom, beta)
Our Personal Space (Ren'py, GPL-3.0, mature)
Outer Space (Python, GPL-2.0, beta)
PARPG (Python, GPL-3.0, beta, inactive since 2012)
PCGen (Java, LGPL-2.1, mature)
PainTown (C++, Java, Python, 3-clause BSD, mature)
Panda 3D (C++, C, 3-clause BSD, mature)
Pang Zero (Perl, GPL-2.0, beta, inactive since 2007)
Pasang Emas (Vala, GPL-3.0, mature)
Pax Britannica (Lua, C, MIT, mature)
Phantasy Star Rebirth (C++, GPL-3.0, beta, inactive since 2013)
Pingus (C++, GPL-3.0, mature)
Pioneer (C++, C, Apache-2.0, GPL-3.0, mature)
Pioneers (C, GPL-2.0, mature)
Pizza Business (C++, GPL-2.0, mature, inactive since 2003)
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)
PyKaraoke (Python, LGPL-2.1, beta, inactive since 2011)
PySol (Python, GPL-2.0, mature, inactive since 2004)
Pymapper (Python, GPL-3.0, mature)
Qt (C++, LGPL-3.0, mature)
Quad-engine (Pascal, MIT, beta)
REGoth (C++, GPL-3.0, beta)
RPDungeon - computer aided role playing (Pascal, GPL-2.0, beta, inactive since 2006)
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)
Red Eclipse (C++, zlib, mature)
Return to the Roots (C++, GPL-3.0, mature)
Rigs of Rods (C++, 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)
Ryzom Core (C++, AGPL-3.0, mature)
S.C.O.U.R.G.E. (C++, GPL-2.0, beta, inactive since 2008)
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)
SWIG (C++, SWIG license, mature)
Scorched 3D (C++, GPL-2.0, mature, inactive since 2014)
Scorched Moon (Python, GPL-3.0, beta)
Scrabble3D (Pascal, GPL-3.0, mature, inactive since 2015)
Scrolling Game Development Kit 2 (C#, ?, mature, inactive since 2017)
ScummVM (C++, GPL-2.0, mature)
Secret Mario 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 DirectMedia Layer (C, zlib, mature)
Simple and Fast Multimedia Library (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++, 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++, MIT, mature)
Story of a Lost Sky (Python, 3-clause BSD, mature)
Stunt Rally (C++, GPL-3.0, mature)
Summoning Wars (C++, GPL-3.0, beta, inactive since 2014)
SuperTuxKart (C++, C, GPL-3.0, mature)
Superpowers (Typescript, ISC, mature)
Supremacy (C#, Ms-RL, beta, inactive since 2014)
T-Bots (C, GPL-2.0, beta, inactive since 2004)
TORCS, The Open Racing Car Simulator (C++, GPL-2.0, mature, inactive since 2016)
TROPHY (C++, GPL-2.0, mature, inactive since 2012)
TVTower (BlitzMax, Lua, Custom, mature)
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 Bub's Brothers (Python, MIT, mature, inactive since 2013)
The Butterfly Effect (C++, GPL-2.0, beta)
The Clans (C, GPL-2.0, beta, inactive since 2003)
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 Legend of Edgar (C, GPL-2.0, mature)
The Mana World (PHP, GPL-2.0, mature)
The hunt for the lost rainbow jewels (Jewelhunt) (Java, GPL-2.0, beta)
Thousand Parsec (C++, Python, GPL-2.0, beta, inactive since 2012)
TinTin++ (C, GPL-3.0, mature)
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)
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)
Tux Football (C++, GPL-2.0, beta, inactive since 2012)
Tux Racer (C, GPL-2.0, beta, inactive since 2001)
Tux of Math Command (C, GPL-3.0, mature, inactive since 2011)
Tuxemon (Python, GPL-3.0, mature)
TwinEngine (C, GPL-2.0, mature, inactive since 2015)
UFO2000 (C++, 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)
UnNetHack (C, Custom, mature)
Underworld Adventures (C++, Lua, GPL-2.0, beta, inactive since 2007)
Unknown Horizons (Python, GPL-2.0, beta)
Unvanquished (C++, GPL-3.0, mature)
Urho3D (C++, AngelScript, MIT, mature)
VASSAL Engine (Java, LGPL-2.1, mature)
VCMI Project (C++, GPL-2.0, mature)
VDrift (C++, GPL-3.0, mature, inactive since 2014)
Valyria Tear (Lua, C++, C, GPL, mature)
Vega Strike (C++, GPL-2.0, mature)
Veloren (Rust, GPL-3.0, beta)
WAtomic (Pascal, GPL-2.0, mature, inactive since 2005)
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)
Widelands (C++, Lua, 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)
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)
XPilot (C, GPL-2.0, mature, inactive since 2010)
XSera (C, Lua, MIT, beta, inactive since 2010)
XU4 (C++, GPL-2.0, mature)
XZ Utils (C, Custom, mature)
Xconq (C++, GPL-2.0, mature, inactive since 2005)
Xenowar (C, C++, GPL-3.0, mature, inactive since 2014)
Xonotic (C, GPL-3.0, mature)
YSoccer (Java, ?, mature, inactive since 2017)
Yo Frankie! (Blender script, ?, mature, inactive since 2009)
ZAngband (C, Custom, mature, inactive since 2005)
ZGameEditor (Pascal, MIT, 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)
Zone of Control (Rust, Apache-2.0, beta, inactive since 2017)
diablo-js (Java, JavaScript, MIT, mature)
jMonkeyEngine (Java, 3-clause BSD, mature)
kiki the nano bot (?, ?, mature, inactive since 2007)
libGDX (Java, C++, C, Apache-2.0, mature)
libpng (C, Custom, mature)
micropolisJS (Javascript, GPL-3.0, mature)
mkxp (C++, C, GPL-2.0, mature)
nXtank (Python, GPL-3.0, beta, inactive since 2010)
pkg-config (C, GPL-2.0, mature)
pyORPG (Python, MIT, beta, inactive since 2015)
pygame (C, Python, LGPL-2.1, mature)
ransack (Python, MIT, mature, inactive since 2016)
rpge (C, GPL-3.0, beta, inactive since 2014)
sandbox Game Maker (C++, C, Custom, mature, inactive since 2014)
wxWidgets (C++, Objective-C, Custom, mature)
xdigger (C, GPL-2.0, mature, inactive since 1999)
xoreos (C++, GPL-3.0, beta)
yaml-cpp (C++, MIT, mature)
zlib (C, zlib, mature)

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