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.
FaceRig - FaceRig is a program that aims to enable anyone with a webcam to digitally embody awesome...
Lumix Engine - Open source 3D game designer and engine written in C++.
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.
MOS - Lightweight game engine.