PTC CoCreate Modeling 3 — Personal Edition (137 Mb):
Description:
A 3D CAD program (which doesn't include the complete feature set of the commercial version).
Homepage and Download Link::
http://www.ptc.com/products/cocreate/modeling-personal-edition-3-0/
http://www.ptc.com/offers/tryout/pe3.htm
Screenshot(s) of Program's Interface:
http://i31.tinypic.com/50js3p.jpg