Synfig Studio - Just another WordPress site
Grit Game Engine - The Grit Game Engine is an MIT-Licensed Open Source Game Engine that is highly scriptable via Lua.
MocapX - Facial Motion capture app Maya and iPhone. With the MocapX animator, you can easily use the iPhone camera to animate characters in real time directly in Maya. MocapX tools enable you to use any custom or production rig as well as any Maya feature.
libtwo - All-purpose c++ app prototyping library, focused towards live graphical apps and games
FaceRig - FaceRig is a program that aims to enable anyone with a webcam to digitally embody awesome...
MOS - Lightweight game engine.