Linux

0 A.D. (C, C++, JavaScript, GPL-2.0, beta)
1oom (C, GPL-2.0, mature)
3D Pong (C, GPL-2.0, beta, inactive since 2004)
4D Maze Game (Java, Public domain, mature, inactive since 2008)
4D-TRIS (C, GPL-2.0, mature, inactive since 2012)
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)
AdaGate (Ada, GPL-3.0, mature)
Afternoon Stalker (C++, GPL-2.0, mature, inactive since 2012)
Airstrike (C, GPL-2.0, beta, inactive since 2014)
Aisleriot (C, Scheme, GPL-3.0, mature)
Aleph One (C++, Lua, GPL-3.0, mature)
Alex the Allegator 4 (C, GPL-2.0, mature, inactive since 2003)
alive (C++, MIT, beta)
Ambermoon.net (C#, GPL-3.0, mature)
AndEngine (Java, Apache-2.0, mature, inactive since 2013)
Annex: Conquer the World (Lua, GPL-3.0, mature, inactive since 2014)
AntiChess (Java, MIT, beta, inactive since 2003)
Ares Dogfighter (Java, GPL-3.0, beta, inactive since 2016)
Armory (Haxe, Python, zlib, mature)
AssaultCube (C, C++, Custom, mature, inactive since 2018)
Athenaeum (Python, GPL-3.0, beta)
Atomic Tanks (C++, C, GPL-2.0, mature, inactive since 2016)
Augustus (C, C++, AGPL-3.0, mature)
Aussenposten (JavaScript, MIT, beta, inactive since 2015)
Azimuth (C, GPL-3.0, mature)
Balder2D (C++, GPL-2.0, beta, inactive since 2009)
Ball and Paddle (C++, Scheme, Shell, GPL-3.0, beta, inactive since 2009)
Batrachians (C++, GPL-2.0, beta, inactive since 2012)
Battle Tanks (C++, GPL-2.0, mature, inactive since 2009)
Berusky (C++, GPL-3.0, mature)
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)
Bitfighter (C, C++, GPL-2.0, mature)
Black Shades (C, GPL-3.0, mature)
Blackvoxel (C++, GPL-3.0, mature)
Bladecoder Adventure Engine (Java, Apache-2.0, mature)
Blitwizard (C, C++, Lua, zlib, beta, inactive since 2015)
Blobby Volley 2 (C++, GPL-2.0, mature, inactive since 2017)
Block Attack - Rise of the Blocks (C++, GPL-2.0, mature)
BlockOut II (C++, GPL-2.0, mature, inactive since 2014)
BomberClone (C, GPL-2.0, beta, inactive since 2010)
Bombermaaan (C++, GPL-3.0, mature, inactive since 2010)
Bombic (C++, Objective-C, GPL-2.0, beta, inactive since 2005)
Brain Workshop (Python, GPL-2.0, mature, inactive since 2011)
Brikx (C++, GPL-2.0, beta, inactive since 2009)
BRIQUOLO (C++, GPL-3.0, mature, inactive since 2008)
Brogue (C, AGPL-3.0, mature)
Brutal Chess (C++, GPL-2.0, beta, inactive since 2007)
BurgerSpace (C++, GPL-2.0, mature, inactive since 2013)
BZFlag (C++, LGPL-2.1, MPL-2.0, mature)
C-Dogs SDL (C, GPL-2.0, mature)
CaesarIA (C++, JavaScript, C, GPL-3.0, beta)
Cannon Smash (C++, GPL-2.0, beta, inactive since 2003)
Canta (Python, GPL-3.0, beta, inactive since 2011)
Caph (C, GPL-3.0, mature, inactive since 2010)
Carnage3D (C++, C, MIT, beta)
Cart Life (AGS Script, Custom, mature, inactive since 2014)
Cartographer (GDScript, Apache-2.0, mature)
Cataclysm: Dark Days Ahead (C++, CC-BY-SA-3.0, mature)
CaveExpress (C, JavaScript, GPL-3.0, mature)
CavePacker (JavaScript, C, C++, Lua, GPL-3.0, mature)
CETech (C, C++, CC0, beta)
Childsplay (Python, GPL-3.0, mature)
Chocolate Doom (C, GPL-2.0, mature)
Chrzaszcz (C++, GPL-3.0, beta, inactive since 2018)
Chunk Stories (Kotlin, Java, LGPL-3.0, beta)
Citybound (Rust, JavaScript, AGPL-3.0, beta)
ClanLib (C, C++, zlib, mature)
Classic RBDoom 3 BFG (C, C++, GPL-3.0, mature)
ClassiCube (C, 3-clause BSD, mature)
Clonepoint (C++, GPL-3.0, beta)
Colditz Escape (C, GPL-3.0, mature)
Commander Genius (C, C++, GPL-2.0, mature)
Cosmosmash (C++, GPL-2.0, mature, inactive since 2013)
CoTerminalApps (Ada, GPL-3.0, mature)
Crack Attack! (C++, GPL-2.0, mature, inactive since 2005)
Craft (C, Python, MIT, mature, inactive since 2017)
CrossUO (C, C++, GPL-3.0, mature)
Crown (C, C++, Vala, MIT, beta)
Crystal Space 3D SDK (C, C++, LGPL-2.1, mature, inactive since 2015)
Cultivation (C++, Public domain, mature, inactive since 2010)
Curse of War (C, C++, GPL-3.0, mature, inactive since 2014)
curses (C, ?, mature, inactive since 2000)
Cuyo (C++, OCaml, GPL-2.0, mature, inactive since 2014)
Cytadela (C++, GPL-3.0, beta, inactive since 2013)
D2X-XL (C++, Custom, GPL-2.0, mature, inactive since 2015)
Daggerfall Unity (C#, MIT, mature)
DarkPlaces (C, GPL-2.0, mature, inactive since 2014)
Dave Gnukem (C++, GPL-2.0, mature)
Deer Portal (C++, zlib, beta)
Defendguin (C, GPL-2.0, mature, inactive since 2009)
DeSmuME (C, C++, GPL-2.0, mature, inactive since 2015)
Destination Sol (Java, Apache-2.0, mature)
dhewm3 (C, C++, GPL-3.0, mature)
Digital: A Love Story (Ren'Py, Python, CC-BY-NC-SA-3.0, mature)
dim3 (C, MIT, beta, inactive since 2014)
Domination (Java, GPL-3.0, mature)
donut (C, C++, GPL-3.0, beta)
Doom Legacy (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)
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)
Dungeon (Java, 3-clause BSD, mature)
Dust Racing 2D (C, C++, GPL-3.0, mature)
DwarfCorp (C#, MIT, mature)
DXX-Rebirth (C, C++, Python, GPL-3.0, Custom, mature)
EasyRPG Editor (C++, GPL-3.0, mature)
Eat The Whistle (C, ?, mature, inactive since 2017)
ECWolf (C++, GPL-2.0, LGPL-2.1, zlib, MIT, IJG, Public domain, mature)
EdisonEngine (C++, Python, LGPL-3.0, beta)
ElonaFoobar (C++, Lua, MIT, mature)
Elysium Engine (C, GPL-2.0, beta, inactive since 2006)
Emilia Pinball (C++, GPL-2.0, beta)
Empty Clip (C++, GPL-2.0, mature)
EmptyEpsilon (C, C++, Lua, GPL-2.0, mature)
Enigma (C, C++, GPL-2.0, mature)
Esenthel Engine (C, C++, Custom, beta)
ET: Legacy (C, C++, Lua, GPL-3.0, mature)
ezEngine (C++, JavaScript, MIT, mature)
ezQuake (C, C++, GPL-2.0, mature)
F-1 Spirit (C++, ?, beta, inactive since 2009)
Falcon's Eye (C, NetHack General Public License, mature, inactive since 2004)
Falltergeist (C++, GPL-3.0, beta)
Faur (C, Python, C++, GPL-3.0, beta)
Fish Fillets - Next Generation (C++, GPL-2.0, mature)
Flare (C++, Java, Python, GPL-3.0, mature)
flixel-gdx (Java, 3-clause BSD, beta, inactive since 2017)
FLTK Recycling Game! (C++, LGPL-2.1, mature, inactive since 2014)
Flukz (C++, GPL-2.0, beta, inactive since 2014)
FooBillard++ (C, GPL-2.0, mature, inactive since 2012)
FooBillard (C, GPL-2.0, mature, inactive since 2010)
Free Hero Mesh (C, JavaScript, Public domain, beta)
Free Mars (Java, GPL-3.0, mature)
freeablo (C++, GPL-3.0, beta)
FreeBlocks (C, Java, GPL-3.0, beta, inactive since 2015)
Freedoom (None, Python, None, beta)
Freeminer (C++, Lua, GPL-3.0, beta)
Freenukum (C, GPL-3.0, beta, inactive since 2009)
FreeSpace 2 Source Code Project (C, C++, Unlicense, mature)
Frets on Fire (Python, GPL-2.0, mature, inactive since 2008)
Friking Shark (C++, C, GPL-3.0, mature)
Frozen Bubble (Perl, C++, GPL-2.0, mature, inactive since 2012)
FTEQW (C, GPL-2.0, mature)
Game Editor (C, C++, GPL-3.0, mature, inactive since 2014)
GameCake (C, C++, Lua, MIT, mature)
gamekit (C++, C, zlib, mature, inactive since 2015)
GamePlay (C++, C, Apache-2.0, mature, inactive since 2016)
GBDK (C, Assembly, C++, MIT, mature)
GCompris (C, Python, GPL-3.0, mature)
Gem Drop X (C, GPL-2.0, beta, inactive since 2002)
GeonBit.UI (C#, MIT, mature)
Gideros (C, C++, Lua, ?, mature)
Gilbert and the doors (C, GPL-3.0, mature, inactive since 2018)
GL-117 (C++, GPL-2.0, mature, inactive since 2005)
glParchis (Python, GPL-3.0, mature)
GLtron (C, ?, beta, inactive since 2017)
Gnome Chess (Vala, GPL-3.0, mature)
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)
Golly (C++, Java, GPL-2.0, mature)
Gottet (C++, GPL-3.0, mature)
GPL Arcade Volleyball (C++, GPL-2.0, beta, inactive since 2006)
Grail (C++, Lua, GPL-3.0, beta, inactive since 2013)
Gravitation (C++, Public domain, mature, inactive since 2008)
Grobots (C++, GPL-2.0, mature, inactive since 2014)
GUSANOS (C++, GPL-2.0, beta, inactive since 2006)
Gweled (C, Shell, GPL-2.0, mature)
GZDoom (C, C++, GPL-3.0, mature)
Hammer of Thyrion (C, GPL-2.0, mature)
Hardwar (C++, GPL-3.0, beta, inactive since 2015)
Harmonist: Dayoriah Clan Infiltration (Go, ISC, beta)
HaxePunk (Haxe, MIT, mature)
Head over Heels (C++, GPL-3.0, mature)
Hedgewars (Lua, C, C++, Pascal, Haskell, GPL-2.0, mature)
Help Hannah's Horse (C++, GPL-2.0, beta, inactive since 2008)
heXon (C++, GPL-2.0, beta)
Hexoshi (Python, GPL-3.0, beta, inactive since 2016)
HHexen (C, GPL-2.0, mature, inactive since 2013)
HoDoKu (Java, GPL-3.0, mature, inactive since 2013)
Holtz (C++, GPL-2.0, mature)
Hopson-Arcade (C++, GPL-3.0, mature)
HyperRogue (C++, GPL-2.0, mature)
I Have No Tomatoes (C++, zlib, mature, inactive since 2004)
Ice Breaker (C, GPL-2.0, mature, inactive since 2003)
iiChantra (C++, MIT, beta, inactive since 2012)
Inexor (C++, JavaScript, zlib, beta, inactive since 2018)
Infinite Mario Bros (Java, 3-clause BSD, mature, inactive since 2010)
Infinite Tux (Java, GPL-3.0, Public domain, mature)
Infon Battle Arena (C, Lua, GPL-2.0, beta, inactive since 2012)
INSTEAD (C, Lua, Java, MIT, mature)
Intersect (C#, MIT, GPL-2.0, beta)
Intricacy (Haskell, GPL-3.0, beta)
ioquake3 (C, GPL-2.0, mature)
iortcw (C, C++, GPL-3.0, mature)
Jake2 (Java, GPL-2.0, beta, inactive since 2006)
Jamp (C++, GPL-3.0, beta, inactive since 2009)
Javelin (Java, GPL-2.0, mature, inactive since 2016)
Jazz² Resurrection (C#, JavaScript, GPL-3.0, mature)
JGame (Java, 3-clause BSD, mature, inactive since 2012)
JSkat (Java, GPL-3.0, Apache-2.0, beta)
JSoko (Java, GPL-3.0, mature)
Jump Don't Die (Java, GPL-3.0, mature)
KevEdit (C, GPL-2.0, mature)
Key Runner (C++, Shell, GPL-3.0, mature, inactive since 2013)
Killer Crates (Java, MIT, beta, inactive since 2017)
Kingdoms (C++, GPL-3.0, beta, inactive since 2014)
KlayGE (C++, GPL-2.0, mature)
KMines (C++, GPL-2.0, mature)
Kobo Deluxe (C++, GPL-2.0, beta, inactive since 2007)
Krank (Python, Public domain, beta, inactive since 2008)
Krystal Drop (C++, GPL-2.0, beta, inactive since 2004)
KungFoo Barracuda (C++, GPL-3.0, mature, inactive since 2016)
L'Abbaye des Morts (C, GPL-3.0, mature, inactive since 2018)
LambdaHack (Haskell, 3-clause BSD, beta)
LambdaRogue: The Book of Stars (Pascal, GPL-2.0, mature, inactive since 2012)
LBreakout2 (C, GPL-2.0, mature, inactive since 2010)
LBreakoutHD (C++, GPL-3.0, mature)
LevelHead (C++, Python, GPL-3.0, mature, inactive since 2009)
LGames (C++, GPL-2.0, mature)
Liberal Crime Squad (C++, GPL-2.0, mature, inactive since 2012)
Librelancer (C, C#, MIT, beta)
LibreMines (C++, GPL-3.0, mature)
LIKO-12 (Lua, Rust, MIT, mature)
LimonEngine (C, C++, LGPL-3.0, beta)
LionEngine (Java, GPL-3.0, mature)
Liquid War (C, Shell, GPL-3.0, mature, inactive since 2015)
Loon Game (Java, C#, Apache-2.0, beta)
Love2dCS (C#, C++, MIT, mature)
Lugaru (C++, GPL-2.0, mature)
Luola (C, GPL-2.0, mature, inactive since 2005)
LÖVE (C++, zlib, mature)
Maelstrom (C, C++, GPL-2.0, mature, inactive since 2002)
ManaPlus (C, Shell, GPL-3.0, mature)
ManiaDrive (PHP, ?, mature, inactive since 2008)
Marble Marcher (C++, GPL-2.0, mature)
Mari0 (Lua, MIT, mature, inactive since 2012)
Maxit (C++, 3-clause BSD, mature, inactive since 2014)
Me and My Shadow (C++, GPL-3.0, beta)
MekWars (Java, GPL-2.0, mature)
Metaforce (C, C++, MIT, beta)
Mindustry (Java, GPL-3.0, mature)
Mines (Vala, GPL-3.0, mature)
Minetest (C, C++, Lua, LGPL-2.1, mature)
mini2Dx (Java, C#, Apache-2.0, mature)
Minilens (GDScript, GPL-3.0, mature, inactive since 2018)
Mininim (C, GPL-3.0, beta, inactive since 2017)
MiniPacman (Ada, GPL-3.0, mature)
Moagg2 (Java, GPL-2.0, mature, inactive since 2008)
Monsterz (Python, WTFPL, beta, inactive since 2007)
Moonbase Assault (Java, MIT, beta, inactive since 2019)
Mr. Rescue (Lua, zlib, mature, inactive since 2016)
Murder In The Public Domain (C++, GPL-3.0, mature, inactive since 2013)
n2048 (C, 2-clause BSD, beta, inactive since 2014)
Nazara Engine (C, C++, MIT, beta)
ncurses (C, MIT, mature)
neoGFX (C++, GPL-3.0, beta)
NetMauMau (C++, LGPL-3.0, mature, inactive since 2015)
Netrek (C, Custom, mature, inactive since 2009)
NFSIISE (C, MIT, mature)
Nikwi (C++, GPL-2.0, beta, inactive since 2012)
No Gravity (C, GPL-2.0, mature, inactive since 2006)
Noiz2sa (C, C++, 2-clause BSD, beta, inactive since 2004)
Not Pacman (Lua, WTFPL, mature, inactive since 2013)
NOVA PINBALL (Lua, GPL-3.0, beta, inactive since 2017)
NullpoMino (Java, 3-clause BSD, mature)
Numpty Physics (C++, GPL-3.0, beta, inactive since 2016)
OGS Mahjong (C++, GPL-3.0, mature, inactive since 2016)
OldSkool Gravity Game (C++, C, GPL-3.0, mature, inactive since 2016)
ONScripter (C++, GPL-2.0, mature, inactive since 2020)
Oolite (Objective-C, C, JavaScript, GPL-2.0, mature)
Open Fodder (C, C++, GPL-3.0, mature)
Open Horizon (C++, MIT, beta)
Open Kick-Off (Java, MIT, beta)
Open Quartz (C, GPL-2.0, beta, inactive since 2004)
Open Rodent's Revenge (C++, MIT, beta, inactive since 2018)
Open RSC (Java, C++, C, Objective-C, GPL-3.0, mature)
Open Yahtzee (C++, GPL-2.0, mature, inactive since 2016)
OpenAlchemist (C++, GPL-2.0, beta, inactive since 2010)
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)
OpenBVE (C#, Public domain, mature)
OpenClonk (C, C++, ISC, mature)
OpenDiablo2 (Go, GPL-3.0, mature)
OpenDungeons (C++, GPL-3.0, beta)
OpenHoW (C, C++, GPL-3.0, beta)
OpenHV (C#, Lua, GPL-3.0, beta)
OpenITG (C, C++, MIT, beta, inactive since 2017)
OpenKrush (C#, GPL-3.0, beta)
OpenLara (C++, C, 2-clause BSD, mature)
OpenMortal (C++, Perl, GPL-2.0, beta, inactive since 2006)
OpenOMF (C, C++, MIT, beta)
OpenRCT2 (C++, GPL-3.0, mature)
OpenRW (C, C++, GPL-3.0, beta)
OpenSAGE (C#, LGPL-3.0, beta)
OpenSolomonsKey (C++, Unlicense, beta)
OpenSupaplex (C, GPL-3.0, mature)
OpenTESArena (C++, MIT, beta)
OpenVIII (C#, MIT, beta)
OPMon (C++, GPL-3.0, beta)
opsu! (Java, GPL-3.0, mature)
Oreon Engine (Java, GPL-3.0, mature)
ouzel (C, C++, Objective-C, 2-clause BSD, beta)
Overgod (C, GPL-2.0, mature, inactive since 2005)
Pacewar (Python, GPL-3.0, mature, inactive since 2017)
Pachi (C, Python, GPL-2.0, mature)
PainTown (C++, Java, Python, 3-clause BSD, mature)
Pang Zero (Perl, GPL-2.0, beta, inactive since 2007)
PARSEC47 (D, 2-clause BSD, beta, inactive since 2003)
Pasang Emas (Vala, GPL-3.0, mature)
Passage (C++, Public domain, mature, inactive since 2011)
Penguin Command (C, GPL-2.0, mature, inactive since 2007)
Pentagram (C++, GPL-2.0, beta, inactive since 2018)
Performous (C, C++, GPL-2.0, mature)
PGU (Python, LGPL-2.1, mature)
Physics Platformer (Java, MIT, beta, inactive since 2019)
Physics Spacewar (Java, MIT, beta, inactive since 2019)
Pillows (Python, GPL-2.0, beta, inactive since 2007)
Pingus (C++, Scheme, GPL-3.0, mature)
Pink Pony (C++, GPL-3.0, mature, inactive since 2017)
Pixel Dungeon (Java, GPL-3.0, mature, inactive since 2015)
Pixel Wheels (Java, GPL-3.0, beta)
PixelLight (C, C++, MIT, mature, inactive since 2012)
Planet Rider (GDScript, GPL-3.0, mature, inactive since 2015)
PLIB (C++, LGPL-2.0, mature, inactive since 2012)
PokerTH (C++, AGPL-3.0, mature, inactive since 2017)
Powermanga (C, GPL-3.0, beta, inactive since 2015)
Powerslave EX (C, C++, GPL-3.0, beta, inactive since 2017)
Powerslide remake (C++, MIT, beta)
Primrose (C++, Public domain, mature, inactive since 2009)
Privateer - Gemini Gold (C++, GPL-2.0, mature, inactive since 2012)
Project-Uranium-Godot (GDScript, MIT, beta)
Project: Starfighter (C, GPL-3.0, mature)
Psyco (C, MIT, mature, inactive since 2008)
Puzzle Moppet (C++, WTFPL, mature, inactive since 2015)
PyChess (Python, TypeScript, GPL-3.0, mature)
Pygame---Alien-Invasion (Python, GPL-3.0, beta, inactive since 2018)
PyKaraoke (Python, C, LGPL-2.1, beta, inactive since 2011)
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 (Python, GPL-3.0, mature, inactive since 2013)
QuakeSpasm (C, GPL-2.0, mature)
Rabbit Escape (Java, GPL-2.0, mature)
Race Into Space (C, C++, GPL-2.0, mature)
raylib (C, C++, C#, zlib, mature)
Recursive Runner (C++, GPL-3.0, beta, inactive since 2017)
Reliquarium (Ada, GPL-2.0, mature)
Ren'Py (C, Python, Ren'Py, LGPL-2.1, mature)
ReTux (Python, GPL-3.0, mature, inactive since 2018)
Ri-li (C++, GPL-3.0, mature, inactive since 2007)
Rocks'n'Diamonds (C, GPL-2.0, mature)
RogueBox Adventures (Python, GPL-3.0, mature, inactive since 2017)
Rolisteam (C++, JavaScript, GPL-2.0, mature)
RPG-X (C, GPL-2.0, mature, inactive since 2015)
rpgboss (Scala, JavaScript, AGPL-3.0, beta, inactive since 2017)
rRootage (C, 2-clause BSD, beta, inactive since 2004)
Ruby-warrior (Ruby, MIT, beta, inactive since 2012)
RufasCube (Ada, GPL-2.0, mature)
RufasSlider (C++, GPL-2.0, mature)
RufasSwap (Ada, GPL-3.0, mature)
SanAndreasUnity (C#, MIT, mature)
Scorched3D (C++, GPL-2.0, mature, inactive since 2014)
Scrabble3D (Pascal, GPL-3.0, mature, inactive since 2015)
SDL Asylum (C, GPL-3.0, mature, inactive since 2009)
SDL Bomber (C, GPL-2.0, mature, inactive since 2012)
SDL Sopwith (C, C++, GPL-2.0, mature, inactive since 2014)
SDL-Ball (C++, GPL-3.0, mature, inactive since 2016)
Settlers III remake (Java, MIT, beta)
Seven Kingdoms: Ancient Adversaries (C++, GPL-2.0, mature)
Shattered Pixel Dungeon (Java, GPL-3.0, mature)
Shockolate (C, GPL-3.0, beta)
Shotgun Debugger (C++, GPL-2.0, mature, inactive since 2005)
Simon Tatham's Portable Puzzle Collection (C, MIT, mature)
Simple Platformer (Java, MIT, beta, inactive since 2019)
Simsu (C++, GPL-3.0, mature)
Slick2D (Java, 3-clause BSD, beta, inactive since 2014)
Slime Volley (C, GPL-3.0, mature, inactive since 2010)
Slingshot (Python, GPL-2.0, beta, inactive since 2007)
Sludge (C, C++, Objective-C, LGPL-2.1, mature)
Smash Battle (C++, GPL-2.0, beta, inactive since 2011)
Snelps (Ruby, LGPL-2.1, beta, inactive since 2012)
SoftPixel Engine (C++, C, zlib, mature, inactive since 2013)
SokoSolve (C#, GPL-3.0, mature, inactive since 2009)
SolarWolf (Python, LGPL-2.1, mature, inactive since 2004)
Sole Collector (Java, MIT, beta, inactive since 2018)
Sonic Robo Blast 2 (C, C++, GPL-2.0, mature)
Space Nerds In Space (C, Lua, GPL-2.0, beta)
SpacePeng! (Java, GPL-3.0, mature, inactive since 2017)
SpaceTrader for Java (Java, GPL-2.0, mature, inactive since 2010)
SpaceZero (C, GPL-3.0, beta)
Spice Trade (Java, LGPL-2.1, mature, inactive since 2005)
Stareater (C#, GPL-3.0, beta)
SteveTech1 (Java, MIT, beta, inactive since 2019)
Stratagus (C++, GPL-2.0, mature)
Stunt Rally (C, C++, GPL-3.0, mature)
Sudokuki (C, Java, GPL-3.0, mature, inactive since 2016)
sundog (C, C++, Python, MIT, beta)
Super Bombinhas (Ruby, GPL-3.0, mature)
Super Methane Brothers (C++, GPL-2.0, mature, inactive since 2011)
SuperStarfighter (GDScript, MIT, beta)
SuperTux (C++, GPL-3.0, beta)
SuperTuxKart (C++, C, GPL-3.0, mature)
SuperTuxParty (GDScript, GPL-3.0, beta)
System Syzygy (Rust, GPL-3.0, mature, inactive since 2018)
T^3 (C++, GPL-2.0, beta, inactive since 2005)
Tactics Squad (C++, GPL-2.0, beta, inactive since 2007)
Taisei Project (C, Python, MIT, mature)
Tangomon (Python, GPL-3.0, mature, inactive since 2017)
TankistOnline (Python, GPL-3.0, beta)
Tanks of Freedom (GDScript, MIT, mature)
Team Tactics (Java, MIT, beta, inactive since 2016)
Teeworlds (C, C++, zlib, beta, inactive since 2013)
Tenes Empanadas Graciela (C, JavaScript, Perl, C++, GPL-2.0, beta, inactive since 2015)
TermFrogger (Ada, GPL-3.0, mature)
TerminalApps (Ada, GPL-3.0, mature)
TES3MP (C++, GPL-3.0, beta)
The Battle for Wesnoth (C, C++, Java, Python, Lua, GPL-2.0, mature)
The Bub's Brothers (Python, C, MIT, mature, inactive since 2013)
The Butterfly Effect (C++, GPL-2.0, beta)
The Dark Mod (C++, GPL-3.0, mature)
The Eternity Engine (C, C++, GPL-3.0, mature)
The Legend of Edgar (C, GPL-2.0, mature)
The Powder Toy (C++, C, Lua, Python, GPL-3.0, mature)
The Secret Chronicles of Dr. M. (C++, GPL-3.0, mature)
Thrive (C++, AngelScript, JavaScript, C#, GPL-3.0, beta)
Thrust (C, GPL-2.0, beta, inactive since 2006)
TinTin++ (C, GPL-3.0, mature)
Toppler (C++, GPL-2.0, mature, inactive since 2012)
TORCS, The Open Racing Car Simulator (C++, C, PHP, GPL-2.0, mature, inactive since 2016)
Torque 2D (C++, C, MIT, mature)
Torque 3D (C++, C, MIT, mature)
Total Annihilation 3D (C++, C, Lua, GPL-2.0, beta, inactive since 2017)
Trackballs (C++, Scheme, GPL-2.0, mature)
Transcend (C++, ?, beta, inactive since 2005)
Tremulous (C, GPL-2.0, mature, inactive since 2016)
Trigger (C++, GPL-2.0, beta)
Trip on the Funny Boat (Python, GPL-2.0, mature, inactive since 2007)
TROPHY (C++, GPL-2.0, mature, inactive since 2012)
Tumbly Towers (Java, MIT, beta, inactive since 2017)
Tumiki Fighters (D, C++, 2-clause BSD, mature, inactive since 2005)
TUSSLE (Python, GPL-3.0, mature, inactive since 2017)
Tux Builder (GDScript, GPL-3.0, beta)
Tux Football (C++, GPL-2.0, beta, inactive since 2012)
Tux of Math Command (C, GPL-3.0, mature, inactive since 2011)
Tux Paint (C, C++, GPL-2.0, beta)
Tuxemon (Python, GPL-3.0, beta)
TuxKart (C++, GPL-2.0, beta, inactive since 2004)
Ultimate Stunts (C++, GPL-2.0, beta, inactive since 2013)
UltraStar Deluxe (Pascal, GPL-2.0, mature)
UltraStar Play (C#, MIT, beta)
Umoria (C, C++, GPL-3.0, mature)
UnCiv (Kotlin, MPL-2.0, beta)
unitystation (C#, AGPL-3.0, beta)
Unvanquished (C, C++, GPL-3.0, mature)
Vamos (C++, Python, GPL-3.0, beta, inactive since 2014)
Vanilla-Conquer (C, C++, Assembly, GPL-3.0, mature)
VASSAL (Java, LGPL-2.1, mature)
VDrift (C++, GPL-3.0, mature, inactive since 2014)
Vectoroids (C, GPL-2.0, mature, inactive since 2002)
Veraball (GDScript, MIT, beta, inactive since 2016)
Vertigo (C, GPL-2.0, beta, inactive since 2002)
Violetland (C++, GPL-3.0, beta)
vitetris (C, 2-clause BSD, beta)
vkQuake (C, C++, GPL-2.0, mature)
Vocaluxe (C#, C++, GPL-3.0, beta, inactive since 2018)
Vorton (C, GPL-3.0, beta, inactive since 2004)
Voxelands (C++, C, GPL-3.0, beta)
Wagic, the Homebrew (C++, C, Objective-C, 3-clause BSD, beta)
warcraft-remake (Java, GPL-2.0, beta)
Which Way Is Up? (Python, GPL-2.0, beta, inactive since 2008)
Wizardry Legacy (C++, C, Objective-C, GPL-3.0, beta, inactive since 2018)
Word War vi (C, GPL-2.0, mature)
X-Moto (C++, GPL-2.0, mature, inactive since 2014)
xBaK (C++, GPL-3.0, beta, inactive since 2013)
XBill (C, Shell, GPL-2.0, mature, inactive since 2001)
XBlast (C, Java, GPL-2.0, mature, inactive since 2005)
xdigger (C, GPL-2.0, mature, inactive since 1999)
XorCurses (C, GPL-3.0, beta, inactive since 2012)
XPilot NG (C, GPL-2.0, mature, inactive since 2010)
XPilot (C, C++, GPL-2.0, mature, inactive since 2010)
XSkat (Java, Custom, mature)
Yamagi Quake II (C, GPL-2.0, 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)
Zandronum (C, Custom, mature, inactive since 2017)
Zatacka (C, C++, GPL-2.0, beta, inactive since 2007)
Zaz (C++, GPL-3.0, beta, inactive since 2010)
ZDoom (C, C++, ZenScript, GPL-3.0, mature)
Zod Engine (C++, ?, mature, inactive since 2018)
Zugspiel (C++, GPL-2.0, beta, inactive since 2004)

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