OpenFx
OVERVIEW
OpenFX is a 3D render and raytrace engine for Windows that supports NURBS, animation, and morphing. An extensive plugin API is also included. It was originally called SoftF/X, but was donated to the community as open source software by Dr. Stuart Ferguson and is now maintained by a large community of developers.
TRAINING
The OpenFX tool has a large number of tutorials published on their website to help you quickly learn the basics and even advanced techniques. The software comes loaded with an extensive library of documentation on how to create your own plugin, explanations about the designer, animator, and renderer functions, as well as data structures and modules.
LINKS
Official Site: www.openfx.org
Wikipedia: Wikipedia Article