- 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)
- Alex the Allegator 4 (C, GPL-2.0, mature, inactive since 2003)
- Alex vs Bus: The Race (C, GPL-3.0, mature)
- Amphetamine (C, GPL-2.0, beta, inactive since 2008)
- Azimuth (C, GPL-3.0, mature)
- Backbone Game Engine (JavaScript, MIT, beta, inactive since 2016)
- Beat Feet (Kotlin, GPL-3.0, mature)
- Blob Wars : Attrition (C, C++, GPL-3.0, mature)
- Blob Wars Episode 2 : Blob And Conquer (C++, GPL-2.0, mature, inactive since 2016)
- Blobwars: Metal Blob Solid (C++, C, GPL-2.0, mature)
- CaveExpress (C, JavaScript, GPL-3.0, mature)
- Cosmo-Engine (C, GPL-2.0, beta)
- Data Storm (C, Apache-2.0, mature, inactive since 2017)
- Dave Gnukem (C++, GPL-2.0, mature)
- DDraceNetwork (C, C++, zlib, mature)
- Executive Man (JavaScript, Custom, mature, inactive since 2017)
- Extreme Tux Racer (C++, GPL-2.0, beta, inactive since 2018)
- freegish (C, GPL-2.0, beta, inactive since 2017)
- FreePrince (C, GPL-2.0, beta, inactive since 2011)
- freeVikings (Ruby, GPL-2.0, beta)
- Gilbert and the doors (C, GPL-3.0, mature, inactive since 2018)
- Gish (C, GPL-2.0, mature, inactive since 2010)
- glPortal (C++, zlib, beta)
- Go Ollie! (?, GPL-3.0, mature, inactive since 2011)
- Gods Deluxe (Java, MIT, mature, inactive since 2020)
- Hurrican (C++, MIT, mature)
- Infinite Mario Bros (Java, 3-clause BSD, mature, inactive since 2010)
- Infinite Tux (Java, GPL-3.0, Public domain, mature)
- Jazz² Resurrection (C#, JavaScript, GPL-3.0, mature)
- Jump Don't Die (Java, GPL-3.0, mature)
- Keen Dreams (C, Assembly, C++, GPL-2.0, mature, inactive since 2014)
- L'Abbaye des Morts (C, GPL-3.0, mature, inactive since 2018)
- Lionheart Remake (Java, GPL-3.0, beta, inactive since 2018)
- M.A.R.S. (C++, C, GPL-3.0, beta, inactive since 2016)
- Mari0 (Lua, MIT, mature, inactive since 2012)
- Mario Objects (C#, MIT, beta)
- Mega Mario (C++, LGPL-2.1, mature, inactive since 2012)
- Minilens (GDScript, GPL-3.0, mature, inactive since 2018)
- Mr. Rescue (Lua, zlib, mature, inactive since 2016)
- Mrfuze (Python, LGPL-2.1, mature, inactive since 2008)
- Nikki and the Robots (Haskell, Lisp, LGPL-3.0, mature, inactive since 2012)
- Nikwi (C++, GPL-2.0, beta, inactive since 2012)
- Nodes-of-Yesod (C#, MIT, beta, inactive since 2015)
- NXEngine-evo (C++, C, GPL-3.0, mature)
- NXEngine (C, C++, GPL-3.0, mature)
- Open Surge (C, GPL-3.0, beta)
- OpenGOAL (Lisp, C++, ISC, beta)
- Physics Platformer (Java, MIT, beta, inactive since 2019)
- Plee the Bear (Lisp, C++, Scheme, C, GPL-3.0, beta, inactive since 2017)
- Red Runner (C#, MIT, mature)
- ReflectionHLE (C, Lua, GPL-2.0, mature)
- REminiscence / REinforced (C++, C, GPL-3.0, mature)
- Replica Island (Java, Apache-2.0, mature, inactive since 2011)
- ReTux (Python, GPL-3.0, mature, inactive since 2018)
- Simple Platformer (Java, MIT, beta, inactive since 2019)
- Smash Battle (C++, GPL-2.0, beta, inactive since 2011)
- Sonic Robo Blast 2 (C, C++, GPL-2.0, mature)
- Steamer Duck (Python, CC0, beta)
- Stringrolled (Python, Public domain, beta, inactive since 2008)
- Super Bombinhas (Ruby, GPL-3.0, mature)
- Super Tilt Bro (Assembly, Python, WTFPL, mature)
- SuperTux Classic (GDScript, GPL-3.0, mature)
- SuperTux (C++, GPL-3.0, beta)
- Teeworlds (C, C++, zlib, beta)
- The Legend of Edgar (C, GPL-2.0, mature)
- The Secret Chronicles of Dr. M. (C++, GPL-3.0, mature)
- TUSSLE (Python, GPL-3.0, mature, inactive since 2017)
- Tux Builder (GDScript, GPL-3.0, beta)
- Tux! (C++, GPL-3.0, beta)
- uMario (C++, GPL-2.0, beta, inactive since 2016)
- Venzone (Haskell, GPL-3.0, mature)
- VVVVVV (ActionScript, C++, Custom, mature)
- Wario-Land-3 (Python, MIT, beta, inactive since 2018)
- WarMUX (C++, GPL-2.0, beta, inactive since 2018)
- Warp Rogue (C, GPL-3.0, beta, inactive since 2010)
- Which Way Is Up? (Python, GPL-2.0, beta, inactive since 2008)
- WWW (JavaScript, GPL-3.0, beta, inactive since 2014)
- XEvil (C++, GPL-2.0, mature)
- YKnytt (C#, MIT, beta)
- Yo Frankie! (Blender Script, ?, mature, inactive since 2009)