As mentioned Muvizu is one of a kind within this field as it offered actual 3D scenes, characters, and props. You can also import your own 3D elements into a scene. Motion tracking is easy, 3D camera operation, lip-syncing, and many more features. You don't have to be an animator to build your first scene in minutes.
Plotagon - This app, Plotagon. is very fun. Creative and lets me express my ideas and all of my desiors!
Synfig Studio - Just another WordPress site
FaceRig - FaceRig is a program that aims to enable anyone with a webcam to digitally embody awesome...
Animation Paper - Animation Paper is a software package for doing 2D animation.
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.
CelAction 2D - CelAction 2D is the name of a powerful and highly advanced 2D animation program for the perfect creation of 2D animation.