Arianne is an engine to develop multiplayer online games like Stendhal
Game engine supporting many 3D/2D formats and graphic effects
Build Cross-platform Applications
Asphyre is a cross-platform framework for Delphi and FreePascal.
Event driven concurrent framework for Python
3D .NET engine for Windows, Linux, Mac
Flexible and easy-to-use 2d game engine
evolution for vegastrike SpaceSim/Combat/Trade game
Multimedia asset management and manipulator for Étoilé
AutoTeach makes kids study and learn in exchange for internet access.
An open source skateboard games engine written in C# and .NET.
Pear3DEngine is a modern and modular 3D development framework
An extensible development framework for roleplay games.
Game framework on top of Python, Panda3D and Twisted
The Lambda-Engine is a cross platform game engine.