| 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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