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BRL-CAD (Ballistic Research Laboratory CAD) is an open-source cross-platform solid modeling system that originated from military research for the U.S. Army Ballistics Research Laboratory. It is one of the oldest and most widely used CAD systems in the world for geometric representation and manipulation of three-dimensional objects, especially those related to military and industrial design needs. BRL-CAD supports a range of geometric representations including NURBS surfaces, metaballs, constructive solid geometry (CSG), boundary representation (BREP), and polygon meshes. The software operates within a command-line environment but also offers tools through its graphical user interface on some platforms. With an extensive library of over 400 tools across more than 30 different categories, BRL-CAD provides a wide array of capabilities for analyzing geometry such as image rendering, high-performance ray tracing for realistic visualization or simulations involving physics-based interaction between objects.