Blender is an integrated suite of tools enabling the creation of a
broad range of 3D content. It offers full functionality for modelling,
rendering, animation, post-production, creation and playback of
interactive 3D content with the benefit of cross-platform operability.
Aimed at media professionals and artists, Blender can be used to create
3D visualizations, stills as well as broadcast quality video.

Documentation for blender is available on the homepage:
http://www.blender.org/download/documentation/