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. | J&L Associates
Developers of the ActiveSolid 3D solid modeling, CAD prototyping and mark-up sharware application and the underlying BspSolid modelling library. | MINOS
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
Keyboard driven modelling software that supports complex curved surfaces. | solidThinking
Modelling software that supports NURBS, polygonal modeling, and subdivision surfaces, available for Windows and Macintosh. | TouchCAD
3D modeling, unfolding and unwrapping program for Macintosh and Windows. |
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