9 sites in 3D Modelling
BRL-CAD
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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://brlcad.org/
MINOS
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A free 3D solid modelling software offering fast hidden line removal, topological functions, 3D geometric constructions, IGES support, shading, printing, hatches, and line constructions.
http://www.le-boite.com/minos.htm
See also