Spine - Spine is 2D animation software designed specifically for software and game development.
TrackIR - TrackIR adds depth to the PC gaming experience by enabling players to take control of the in-game view.
Synfig Studio - Just another WordPress site
FaceTrackNoIR - FaceTrackNoIR is only available for Windows-based PC's (sorry, we have to start somewhere) and...
DragonBones - DragonBones is an open source project for 2D skeletal animation.
GiMeSpace Cam Control - Control your computer by making gestures in front of the webcam.