Get Blender

 

Blender is a free, open-source 3D rendering program that features a great list of animation essentials that include interface, modeling, rigging, rendering, animation, UV unwrapping, shading, real time 3D/Game creation and many others.  It has a feature-packed interface loaded with useful
and intrinsic tools.

http://www.blender.org/

http://www.blender.org/download/get-blender/