- Athenaeum (Python, GPL-3.0, beta)
- AutoREALM (C++, GPL-3.0, mature)
- Bt Builder (C, C++, GPL-3.0, beta)
- C.Y.O. Adventures, text game generator (Ada, GPL-2.0, beta, inactive since 2012)
- Cartographer (GDScript, Apache-2.0, mature)
- CBoard (C, GPL-2.0, beta, inactive since 2018)
- D-Fend Reloaded (Pascal, GPL-3.0, mature, inactive since 2015)
- Dedalus (JavaScript, GPL-2.0, beta, inactive since 2018)
- Deity (Python, GPL-2.0, mature, inactive since 2014)
- Dungeon Mapper (C++, GPL-3.0, beta, inactive since 2013)
- EasyRPG Editor (C++, GPL-3.0, mature)
- Fantasy Map Generator (JavaScript, MIT, mature)
- GBDK (C, Assembly, C++, MIT, mature)
- GM Tools (C++, C, GPL-2.0, beta, inactive since 2004)
- GoRogue (C#, MIT, mature)
- Goxel (C, C++, GPL-3.0, beta)
- JaNaG - Java Name Generator (Java, GPL-3.0, mature, inactive since 2016)
- KevEdit (C, GPL-2.0, mature)
- Libre: The Open Source Card Game (Python, Script, AGPL-3.0, mature, inactive since 2010)
- Mafia: Toolkit (C#, MIT, mature)
- Memoria (C#, MIT, mature)
- MonoGame.Extended (C#, MIT, mature)
- Monster Generator (Java, MIT, mature)
- Necklace of the Eye (C++, GPL-3.0, mature, inactive since 2016)
- NetRadiant-custom (C++, C, GPL-2.0, mature)
- opsu! (Java, GPL-3.0, mature)
- PCGen (Java, LGPL-2.1, mature)
- Pendumito (JavaScript, GPL-2.0, mature, inactive since 2003)
- Procedural Map Generator (C++, MIT, mature, inactive since 2018)
- Psyco (C, MIT, mature, inactive since 2008)
- Pymapper (Python, GPL-3.0, mature)
- PyTMX (Python, LGPL-3.0, mature)
- ReShade (C++, 3-clause BSD, mature)
- rFXGen (C, zlib, mature)
- Rolemaster Office (Java, Apache-2.0, mature)
- Rolisteam (C++, JavaScript, GPL-2.0, mature)
- RPDungeon - computer aided role playing (Pascal, GPL-2.0, beta, inactive since 2006)
- sfxr (C++, MIT, mature, inactive since 2012)
- SLADE (C++, GPL-2.0, mature)
- Slick2D (Java, 3-clause BSD, beta, inactive since 2014)
- Squiffy (JavaScript, MIT, mature)
- SR (C, Assembly, MIT, GPL-2.0, ?, mature)
- TTDPatch (Assembly, C, C++, GPL-2.0, mature, inactive since 2013)
- Turbu (Pascal, MPL-1.1, beta, inactive since 2013)
- Twine (JavaScript, TypeScript, GPL-3.0, mature)
- UndertaleModTool (C#, GPL-3.0, beta)
- VGC (C++, Apache-2.0, beta)
- Wind Waker Randomizer (Python, Assembly, MIT, mature)
- World Builder (Visual Basic, GPL-2.0, mature, inactive since 2007)
- Zeta (C, MIT, beta)