Game engine supporting many 3D/2D formats and graphic effects
Spring is a free RTS engine developed for Windows, Linux and Mac OS X.
Build Cross-platform Applications
Asphyre is a cross-platform framework for Delphi and FreePascal.
Perl bindings to the Modern OpenGL API
3D .NET engine for Windows, Linux, Mac
Flexible and easy-to-use 2d game engine
c# lua bind with unity3d project for game development
Multimedia asset management and manipulator for Étoilé
A graphics engine + toolkit.
3D game engine for C and C++
Extremely simple joystick rumble / vibration library
Game development toolkit
An open source skateboard games engine written in C# and .NET.
Pear3DEngine is a modern and modular 3D development framework
C++ Game programming Framework
An extensible development framework for roleplay games.
The Lambda-Engine is a cross platform game engine.