Blender

Blender is the open source software for 3D modeling, animation, rendering, post-production, interactive creation and playback. Available for all major operating systems under the GNU General Public License. . Revolutionary non-overlapping and non-blocking UI delivers unsurpassed workflow . Flexible and fully configurable window layout with as many screen setups as you prefer video sequence editing, character animation action editor, non-linear animation mixer, image/UV editing, file/image selection and file management . Built-in text editor for annotations and editing Python scripts . Consistent interface across all platforms . A range of 3D object types including polygon meshes, NURBS surfaces, bezier and B-spline curves, metaballs, vector fonts (TrueType, PostScript, OpenType) . Smooth proxy style catmull-clark subdivision surfaces with optimal iso-lines display and sharpness editing . Armature (skeleton) deformation with forward/inverse kinematics, auto skinning and interactive 3D paint for vertex weighting . Non-linear animation mixer with automated walkcycles along paths .

Powerfull renderer for animations.Constraint system . Vertex key framing for morphing, with controlling sliders . Oversampling, motion blur, post-production effects, fields, non-square pixels . Environment maps, halos, lens flares, fog . Various surface shaders such as Lambert, Phong, Oren-nayar, Blinn, Toon .
Edge rendering for toon shading . Procedural Textures . Graphical editor for defining interactive behavior without programming . Collision detection and dynamics simulation . Playback of games and interactive 3D content without compiling or preprocessing . Audio, using the SDL toolkit . Multi-layering of Scenes for overlay interfaces . Read / Write TGA, JPG, PNG, Iris, SGI Movie, IFF, AVI and Quicktime GIF, TIFF, PSD, MOV (Windows and Mac OS X).

-Python installed