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...
Pygame - Pygame is a set of Python modules designed for writing games.
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.
Blender - Blender is the open source, cross platform suite of tools for 3D creation.
Papagayo - This app is used to make lip sync thing so that your voice isn't left un-synced.