A cross-platform OpenGL based lightweight scenegraph library
AMOS BASIC reimplementation in Java
Cross-platform 2D game engine
A cross platform 3d c++ game engine
Game framework on top of Python, Panda3D and Twisted
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Read and write PGN format and test moves for legality.
The Lambda-Engine is a cross platform game engine.
Basic real-time simulation engine in C++
Make games with Lego-like building blocks