Soude

Soude builds on Soda Constructor's idea of a dynamic deformable mesh, except you can use a pencil to draw on the mesh, and create what amounts to a dynamic drawing that you can pull, push, move around, and animate. The default mesh is a stick figure, but you can edit the mesh and create arbitrary creatures. Soude's user interface is incredible simple, and the program comes with plenty of examples you can play around with.