Blender is the free and open source 3D creation suite. It supports the entirety of the 3D pipeline—modeling, rigging, animation, simulation, rendering, compositing and motion tracking, even video editing and game creation.
The official website.
Download the software.
HERE are some tutorials from the Blender site but there are MANY free tutorials on all blender has to offer, just google what you need.
IM Editor ( edit .im files )