Programming eXperience Toolkit
Fast, user-friendly cross-platform custom launcher for Minecraft
Accuracy-focused XNA4 reimplementation for open platforms
One framework for creating powerful cross-platform games
OpenLauncher is an open source Minecraft launcher developed in Python.
GemRB is a portable open-source implementation of the Infinity Engine
LDraw™ editor for LEGO® style digital building instructions.
Real-time collision detection and multi-physics simulation for VR
Android, DOS, FirefoxOS, Linux, MacOS and Windows all in one..
a game library to develop audio games