Java game engine for shoot 'em ups, using Java2D.
Cross-platform reimplementation of AMOS BASIC (runtime)
The classic intelligent role playing game
A cross-platform OpenGL based lightweight scenegraph library
Cross-platform 2D game engine
Game framework on top of Python, Panda3D and Twisted
also download updates from files section
Zap Engine
Make games with Lego-like building blocks