BRL-CAD - Army Research Laboratory
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| The BRL-CAD package is a powerful Constructive Solid Geometry (CSG)
| solid modeling system with over 20 years development and production
| use by the U.S. military. BRL-CAD includes an interactive geometry
| editor, parallel ray-tracing support for rendering and geometric
| analysis, path-tracing for realistic image synthesis, network
| distributed framebuffer support, image-processing and
| signal-processing tools. The entire package is distributed
| in source code form.
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http://www.brlcad.org/
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