- Aisleriot (C, Scheme, GPL-3.0, mature)
- BetterSpades (C, GPL-3.0, beta)
- Card Stories (JavaScript, Python, AGPL-3.0, beta, inactive since 2012)
- Deer Portal (C++, zlib, beta)
- Forge (Java, GPL-3.0, mature)
- Gnome Hearts (Python, GPL-2.0, mature, inactive since 2015)
- Godot Card Game Framework (GDScript, AGPL-3.0, mature)
- Heroes of Civilizations (C++, C#, GPL-2.0, beta)
- JSkat (Java, GPL-3.0, Apache-2.0, beta)
- Libre: The Open Source Card Game (Python, Script, AGPL-3.0, mature, inactive since 2010)
- Magarena (Java, Groovy, GPL-3.0, mature)
- NetMauMau (C++, LGPL-3.0, mature, inactive since 2015)
- OpenEtG (JavaScript, MIT, beta)
- OpenTriad (Java, GPL-3.0, beta, inactive since 2017)
- PySol (Python, GPL-2.0, mature, inactive since 2004)
- Simple-Solitaire (Java, GPL-3.0, mature)
- Tressette (C++, GPL-2.0, mature, inactive since 2017)
- Wagic, the Homebrew (C++, C, Objective-C, 3-clause BSD, beta)
- Walic (Kotlin, Apache-2.0, mature)
- Wizards Magic (Python, GPL-2.0, mature, inactive since 2012)
- XMage (Java, MIT, mature)
- XSkat (Java, Custom, mature)