- 2Moons Browsergame Engine (PHP, JavaScript, MIT, mature)
- 3d.city (JavaScript, GPL-3.0, mature, inactive since 2016)
- ACM (C, GPL-2.0, mature, inactive since 2000)
- Augustus (C, C++, AGPL-3.0, mature)
- Billiards (Lua, Objective-C, GPL-3.0, beta, inactive since 2012)
- Biogenesis (Java, GPL-2.0, beta)
- Black Shades Elite (C, C++, GPL-2.0, beta, inactive since 2007)
- Black Shades (C, GPL-3.0, mature)
- Blackvoxel (C++, GPL-3.0, mature)
- Bridge Command (C++, GPL-2.0, mature)
- Bygfoot (Java, GPL-2.0, beta)
- CaesarIA (C++, JavaScript, C, GPL-3.0, beta)
- Caph (C, GPL-3.0, mature, inactive since 2010)
- Cart Life (AGS Script, Custom, mature, inactive since 2014)
- Chunk Stories (Kotlin, Java, LGPL-3.0, beta)
- Citybound (Rust, JavaScript, AGPL-3.0, beta)
- Civitas (Java, Blender Script, GPL-2.0, beta, inactive since 2017)
- Combat Simulator Project (C++, GPL-2.0, beta, inactive since 2010)
- Construo (C++, GPL-3.0, beta, inactive since 2015)
- Core War (C, Java, GPL-2.0, 2-clause BSD, mature)
- CorsixTH (Lua, C++, MIT, mature)
- Critterding (C++, GPL-2.0, beta, inactive since 2013)
- Cubyz (Java, GPL-3.0, beta)
- Cultivation (C++, Public domain, mature, inactive since 2010)
- Cytopia (C++, GPL-3.0, beta)
- Danger from the Deep (C++, C, GPL-2.0, beta, inactive since 2011)
- Divercity (Java, GPL-3.0, beta, inactive since 2015)
- Dope Wars (C, GPL-2.0, mature, inactive since 2013)
- Eat The Whistle (C, ?, mature, inactive since 2017)
- Ecksdee (C++, GPL-2.0, beta, inactive since 2009)
- EliFUT Android (Java, Kotlin, Apache-2.0, mature)
- Elite remake (C, 3-clause BSD, mature, inactive since 2008)
- Emilia Pinball (C++, GPL-2.0, beta)
- F-1 Spirit (C++, ?, beta, inactive since 2009)
- Fairy-Max (C, Custom, mature, inactive since 2018)
- Falcon's Eye (C, NetHack General Public License, mature, inactive since 2004)
- Fictional Air Combat (C, C++, GPL-3.0, beta, inactive since 2012)
- FlightGear (C++, GPL-2.0, mature)
- FooBillard++ (C, GPL-2.0, mature, inactive since 2012)
- FooBillard (C, GPL-2.0, mature, inactive since 2010)
- FreeFalcon (C, C++, 2-clause BSD, inactive since 2014)
- Freekick 3 (C++, Python, GPL-3.0, mature, inactive since 2015)
- Freeminer (C++, Lua, GPL-3.0, beta)
- FreeSims (C#, MPL-2.0, beta)
- FreeSO (C#, MPL-2.0, beta)
- FreeSpace 2 Source Code Project (C, C++, Unlicense, mature)
- FreeTrain (C#, C++, LGPL-2.1, beta, inactive since 2009)
- GL-117 (C++, GPL-2.0, mature, inactive since 2005)
- GLSpeed (Pascal, C, GPL-2.0, mature)
- GLXY (Java, Apache-2.0, mature)
- Gnomescroll (C, C++, Python, GPL-3.0, beta, inactive since 2013)
- Golly (C++, Java, GPL-2.0, mature)
- Grobots (C++, GPL-2.0, mature, inactive since 2014)
- Hardwar (C++, GPL-3.0, beta, inactive since 2015)
- Hematite (Rust, MIT, beta)
- HexGL (JavaScript, CoffeeScript, MIT, mature, inactive since 2016)
- Infiniminer (C#, MIT, mature, inactive since 2016)
- Infon Battle Arena (C, Lua, GPL-2.0, beta, inactive since 2012)
- Jactorio (C++, MIT, beta)
- Julius (C, C++, AGPL-3.0, mature)
- KeeperRL (C, C++, GPL-2.0, beta)
- Librelancer (C, C#, MIT, beta)
- LinCity-NG (C++, GPL-2.0, mature)
- Lincity (C, GPL-2.0, mature, inactive since 2005)
- Liquid Wars (C++, Java, GPL-3.0, mature, inactive since 2014)
- Manic Digger (C#, Public domain, Unlicense, mature, inactive since 2017)
- Micropolis (C++, Java, Python, GPL-3.0, mature, inactive since 2015)
- micropolisJS (JavaScript, GPL-3.0, mature)
- MineClone 2 (Lua, GPL-3.0, beta)
- MineCraft-One-Week-Challenge (C++, C, MIT, beta)
- minecraft-weekend (C, MIT, beta)
- Minecraft (C++, C, MIT, beta)
- Minetest Game (Lua, LGPL-2.1, mature)
- NetStatsBaseball (C, Public domain, mature)
- Numpty Physics (C++, GPL-3.0, beta, inactive since 2016)
- Oolite (Objective-C, C, JavaScript, GPL-2.0, mature)
- Open Horizon (C++, MIT, beta)
- Open Jumpgate (C++, GPL-2.0, beta, inactive since 2017)
- Open Rails (C#, GPL-3.0, mature)
- Open Simulator (C#, 3-clause BSD, beta)
- Open Valley (C++, CC-BY-NC-SA-4.0, beta)
- OpenArena (Java, GPL-3.0, beta)
- openblack (C, C++, GPL-3.0, beta)
- OpenBlox (Python, Lua, GPL-3.0, beta, inactive since 2011)
- OpenBVE (C#, Public domain, mature)
- openc2e (C, C++, LGPL-2.1, beta)
- OpenCity (C++, GPL-2.0, beta, inactive since 2015)
- OpenFly (C, GPL-2.0, beta, inactive since 2001)
- OpenGoo (C, C++, GPL-3.0, beta, inactive since 2016)
- OpenKeeper (Java, GPL-3.0, beta)
- OpenLoco (C++, MIT, mature)
- OpenRCT2 (C++, GPL-3.0, mature)
- OpenSC2K (JavaScript, GPL-3.0, beta)
- OpenSkyscraper (C++, GPL-2.0, beta)
- OpenTS2 (C#, MPL-2.0, beta)
- OpenTTD (C++, GPL-2.0, mature)
- Our Personal Space (Ren'Py, GPL-3.0, mature)
- Outpost HD (C++, 3-clause BSD, beta)
- Pioneer (C, C++, Lua, Apache-2.0, GPL-3.0, mature)
- Planet Lander (Python, MIT, mature, inactive since 2020)
- pq2 (C++, GPL-3.0, mature)
- Prescription Wars (ColdFusion, JavaScript, GPL-3.0, mature, inactive since 2016)
- Privateer - Gemini Gold (C++, GPL-2.0, mature, inactive since 2012)
- Project Dollhouse (C#, MPL-2.0, beta)
- pycraft (C, Python, GPL-2.0, mature, inactive since 2018)
- Race Into Space (C, C++, GPL-2.0, mature)
- RedShift (C, C++, GPL-2.0, beta, inactive since 2008)
- Rigs of Rods (C, C++, AngelScript, GPL-3.0, mature)
- sandspiel (Rust, JavaScript, TypeScript, MIT, beta)
- sccopter (C, C++, MIT, beta, inactive since 2019)
- sh3redux (C, C++, GPL-3.0, beta, inactive since 2019)
- Simutrans (C++, Artistic License-1.0, mature)
- Sopwith 3 (C, C++, Objective-C, GPL-2.0, beta, inactive since 2003)
- Speed Dreams (C++, GPL-2.0, mature)
- StressFreeZone (C++, Lua, GPL-3.0, beta, inactive since 2007)
- sundog (C, C++, Python, MIT, beta)
- T-Bots (C, C++, GPL-2.0, beta, inactive since 2004)
- The Butterfly Effect (C++, GPL-2.0, beta)
- The Powder Toy (C++, C, Lua, Python, GPL-3.0, mature)
- Theme Park Builder 3D CAD (C++, GPL-3.0, beta, inactive since 2013)
- Thunder&Lightning (C, C++, Io, GPL-2.0, beta, inactive since 2015)
- TORCS, The Open Racing Car Simulator (C++, C, PHP, GPL-2.0, mature, inactive since 2016)
- Tornado (C, GPL-2.0, mature, inactive since 2009)
- Torrega Race (Lua, GPL-3.0, mature, inactive since 2015)
- 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)
- Tux Football (C++, GPL-2.0, beta, inactive since 2012)
- Vamos (C++, Python, GPL-3.0, beta, inactive since 2014)
- VDrift (C++, GPL-3.0, mature, inactive since 2014)
- Vertigo (C, GPL-2.0, beta, inactive since 2002)
- Vircadia (C++, Apache-2.0, mature)
- Voxelands (C++, C, GPL-3.0, beta)
- WallBall (Haxe, JavaScript, GPL-3.0, mature)
- YSoccer (Java, GPL-2.0, mature)
- Zen! (Java, GPL-2.0, mature)
- Zugspiel (C++, GPL-2.0, beta, inactive since 2004)