Here are some links to different free 3D software out their.
~
Blender, Open Source 3d character design software.
~
Clay, clay like modeling from the developer of touchlib.
~
anim8tor, An animation program.
~
Sketchup, 3D Modeling and design.
I'm sure there are more feel free to add them to this post, and please leave a review if you try or have tryed these programs.