Free Stuff: Art Of Illusion Software
Art of Illusion is a free, open source 3D modelling and rendering studio. Many of its capabilities rival those found in commercial programs. Highlights include subdivision surface based modelling tools, skeleton based animation, and a graphical language for designing procedural textures and materials.
The current version is 3.0.3, released Dec. 12, 2016. This version is both stable and powerful enough to be used for serious, high end animation work.