Arianne is an engine to develop multiplayer online games like Stendhal
evolution for vegastrike SpaceSim/Combat/Trade game
AutoTeach makes kids study and learn in exchange for internet access.
Pygrid is an open-source and cross-platform pygame/python 2D engine.
A graphics engine + toolkit.
Sprite Font Creator
Game framework on top of Python, Panda3D and Twisted
The Lambda-Engine is a cross platform game engine.
Make games with Lego-like building blocks
Atlarius is no longer under development.