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3D Graphics:
3Delight Free - http://www.3delight.com/index.htm
Anim8or - http://www.anim8or.com/
Art Of Illusion - http://www.artofillusion.org/
Blender - http://www.blender3d.org/
Freestyle - http://freestyle.sourceforge.net/
Gelato - http://www.nvidia.com/page/gz_home.html
Houdini (Free Edition) - http://www.sidefx.com/index.php?option=com...3&Itemid=89
Maya Personal Learning Ed. - http://usa.autodesk.com/adsk/servlet/index...&id=7639525
Now3D - http://digilander.libero.it/giulios/Eng/homepage.htm
OpenFX - http://www.openfx.org
Pointshop 3D - http://graphics.ethz.ch/pointshop3d/downloadPS3D20.html
POV-Ray - http://www.povray.org/
SketchUp - http://sketchup.google.com/
Terragen - http://www.planetside.co.uk/terragen/
Toxic - http://www.toxicengine.org/
Wings 3D - http://www.wings3d.com/