Synfig Studio - Just another WordPress site
Jpixel - JPixel is an editor for making pixel art animations and tilesets.
FaceRig - FaceRig is a program that aims to enable anyone with a webcam to digitally embody awesome...
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.
DragonBones - DragonBones is an open source project for 2D skeletal animation.
CelAction 2D - CelAction 2D is the name of a powerful and highly advanced 2D animation program for the perfect creation of 2D animation.