BRL-CAD

BRL-CAD is a combinatorial solid modeling system for creating and analyzing 3D geometry. It pairs an interactive 3D solid geometry editor with a network-distributed, multiprocessing ray tracer and geometric analysis tools, used in vehicle, mechanical, and architectural design as well as visualization work.

You build models from boolean CSG operations - union, intersection, and difference - across many geometry types, from implicit primitives like boxes, ellipsoids, cones, and tori to NURBS surfaces, n-Manifold Geometry, and faceted meshes. Bundled image and signal-processing tools, a geometry scripting interface, and a performance benchmark suite round out the package.

Developed since 1979, BRL-CAD runs on Linux, macOS, and Windows, with releases that include source archives and binary builds for common operating systems.