Arianne is an engine to develop multiplayer online games like Stendhal
Utility for viewing ZX Spectrum emulator snapshot files.
Built to be ease of use, with no programming knowledge, Multi-platform
Modular Gaming Open Source Persistent Browser Based Game Framework
Kinect based controller.
Pygrid is an open-source and cross-platform pygame/python 2D engine.
Phobos editor is a generic resource editing system.