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3D Design Software
A great and free 3D design software. Start here is you are new to 3D Design.
SketchUp STL Plugin
Use this SketchUp plugin to export your 3D model as a .stl file.
Free open source program for 3D modeling, visual effects, animation, and more. Lots of tutorials available here: http://www.blender.org/support/tutorials/
Free 3D Mathematical modeling program. Great for 3D Printed mathematical shapes!
Meshlab is a must have piece of software for all 3D Designers. It is a great 3D mesh viewer, editor, and file converter.
Awesome service that will automatically repair errors in .stl file surfaces.