BRL-CAD is a powerful cross-platform open source combinatorial Constructive Solid Geometry (CSG) solid modeling system that includes interactive 3D solid geometry editing, a network-distributed symmetric multiprocessing high-performance ray-tracer, network-distributed framebuffer support, image and
... [More] signal-processing tools, ray-tracing support for rendering and geometric analysis, path-tracing for realistic image synthesis, numerical processing libraries, a system performance analysis benchmark suite, an embedded scripting interface, and a robust high-performance geometric representation and analysis library.
BRL-CAD is extensively cross-platform supporting Windows, Mac OS X, Linux, BSD, IRIX, Solaris, and more. BRL-CAD's development heritage of more than 20 years continues to grow. [Less]
Aqsis is a cross-platform photorealistic 3D rendering solution, based on the RenderMan interface standard defined by Pixar Animation Studios.
Focusing on stability and production usage, features include constructive solid geometry, depth-of-field, extensible shading engine (DSOs), instancing
... [More], level-of-detail, motion blur, NURBS, procedural plugins, programmable shading, subdivision surfaces, subpixel displacements and more. [Less]
A modeller to generate POV-Ray-files. It is primerly based on simple objects like sphere, box, torus,... witch can be used in CSG together. But also more meshed based objects like spline shapes and so on are possible.