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 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.