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brlcad: BRL-CAD (Open-source solid modeling system)
brlcad:
brlcad: BRL-CAD is a powerful cross-platform open source solid modeling
brlcad: system that includes interactive geometry editing, high-performance
brlcad: ray-tracing for rendering and geometric analysis, image and signal-
brlcad: processing tools, a system performance analysis benchmark suite,
brlcad: libraries for robust geometric representation, with more than 20
brlcad: years of active development.
brlcad: 
brlcad: http://brlcad.org/
brlcad: