- Armagetron Advanced (C++, GPL-2.0, mature)
- Astromenace (C++, C, GPL-3.0, mature)
- BZFlag (C++, LGPL-2.1, MPL-2.0, mature)
- Ballerburg (C, Public Domain, mature, inactive since 1987)
- Biniax (C, zlib, mature, inactive since 2012)
- Boulder Dash (Java, MIT, mature, inactive since 2015)
- C-Dogs (C, GPL-2.0, mature)
- Cabbages and Kings (Python, MIT, mature)
- Cat Mother Dead Justice (C++, 3-clause BSD, beta, inactive since 2003)
- Chromium B.S.U. (C++, Artistic License, mature)
- CommandoJS (JavaScript, CoffeeScript, MIT, beta, inactive since 2012)
- Epiar (C, C++, Lua, GPL-2.0, beta)
- Freedoom (Python, BSD, beta)
- GDash (C++, MIT, beta)
- GLtron (C, GPL, beta, inactive since 2016)
- Gang Garrison 2 (Game Maker Script, MPL, mature)
- Linwarrior 3D (C++, Apache-2.0, mature, inactive since 2010)
- Liquid War (C, GPL-3.0, mature, inactive since 2015)
- Lugaru (C++, GPL-2.0, mature)
- Maelstrom (C++, GPL-2.0, mature, inactive since 2002)
- MechCommander 2 Omnitech (C++, MPL, beta, inactive since 2013)
- Netrek (?, mature, inactive since 2009)
- Neverball (C, GPL-2.0, mature)
- Nexiuz (?, mature)
- Open Sonic (C, GPL-2.0, beta)
- Open Zelda (C++, zlib, beta)
- OpenArena (C, GPL-2.0, mature, inactive since 2012)
- OpenClonk (C, C++, ISC, mature)
- Red Eclipse (C++, zlib, mature)
- Rocks'n'Diamonds (C, GPL-2.0, mature)
- Secret Mario Chronicles (C++, GPL-3.0, mature, inactive since 2009)
- Smash (JavaScript, MIT, mature)
- Speed Dreams (C++, GPL-2.0, mature)
- SuperTuxKart (C++, C, GPL-3.0, mature)
- Tremulous (C, GPL-2.0, mature, inactive since 2016)
- Tumiki Fighters (D, 2-clause BSD, mature, inactive since 2005)
- Tux Racer (C, GPL-2.0, beta, inactive since 2001)
- UltraStar (Pascal, ?, mature, inactive since 2010)
- Unvanquished (C++, GPL-3.0, mature)
- X-Moto (C++, GPL-2.0, mature, inactive since 2014)
- XPilot (C, GPL-2.0, mature, inactive since 2010)
- Xonotic (C, GPL-3.0, mature)
- Yo Frankie! (Blender script, ?, mature, inactive since 2009)
- xdigger (C, GPL-2.0, mature, inactive since 1999)