http://www.artzend.com/3D%20Programs.htm
3Delight Free – http://www.3delight.com/index.htm
Anim8or – http://www.anim8or.com/
Blender – http://www.blender3d.org/
Daz Studio – http://www.daz3d.com/i.x/software/studio/-/?
Houdini (Free Edition) – http://www.sidefx.com/apprentice/index.html
Computer Graphics books – http://2020ok.com/4134.htm
Now3D – http://digilander.libero.it/giulios/Eng/homepage.htm
OpenFX – http://www.openfx.org
POV-Ray – http://www.povray.org/
SOFTIMAGE|XSI EXP – http://www.softimage.com/products/exp/v3/
Terragen – http://www.planetside.co.uk/terragen/
TrueSpace – http://www.caligari.com/Products/trueSpace/tS75/Brochure/Intro.asp
Toxic – http://www.toxicengine.org/
Wings 3D – http://www.wings3d.com/
An article on this topic:
http://www.hongkiat.com/blog/25-free-3d-modelling-applications-you-should-not-miss/