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.
Godot Engine - Feature-packed 2D and 3D open source game engine.
Plotagon - This app, Plotagon. is very fun. Creative and lets me express my ideas and all of my desiors!
Unity - The multiplatform game creation tools for everyone.
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.
Unreal Engine - Unreal Engine 4 is a suite of integrated tools for game developers to design and build games, simulations, and visualizations.
FaceRig - FaceRig is a program that aims to enable anyone with a webcam to digitally embody awesome...