BRL-CAD
An Open Source CSG solid modeling system with ray tracing support for rendering and geometric analysis, network distributed framebuffer support, image-processing and signal-processing tools.
http://www.brlcad.org/ |
Google PR:  |
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Solid Thinking
Modelling software that supports NURBS, polygonal modeling, and subdivision surfaces, available for Windows and Macintosh.
http://www.solidthinking.com/ |
Google PR: |
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TouchCAD
3D modeling, unfolding and unwrapping program for Macintosh and Windows.
http://www.touchcad.com/ |
Google PR: |
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