BRL-CAD « http://brlcad.org/ | | 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. |
J& L Associates « http://activesolid.ncf.ca/ | | Developers of the activesolid 3d solid modeling , cad prototyping and mark-up sharware application and the underlying bspsolid modelling library. |
MINOS « http://www.le-boite.com/minos.htm | | A free 3d solid modelling software offering fast hidden line removal , topological functions , 3d geometric constructions , iges support , shading , printing , hatches , and line constructions. |
RogCAD « http://rogcad.com/ | | Keyboard driven modelling software that supports complex curved surfaces. |
solidThinking « http://www.solidthinking.com/ | | Modelling software that supports nurbs , polygonal modeling , and subdivision surfaces , available for windows and macintosh. |
TouchCAD « http://www.touchcad.com/ | | 3d modeling , unfolding and unwrapping program for macintosh and windows. |