BRL-CAD is a constructive solid geometry (CSG) solid modeling computer-aided design (CAD) system. It includes an interactive geometry editor, ray tracing support for graphics rendering and geometric analysis, computer network distributed framebuffer support, scripting, image-processing and signal-processing tools. Developed by U.S. Army Research Laboratory
License: Open Source
BRL-CAD is a powerful tool focused on precision engineering and scientific applications, making it ideal for users needing robust modeling capabilities. In contrast, FreeCAD offers a more user-friendly experience with strong parametric modeling features, making it suitable for a broader audience, including beginners.