OpenSCAD is a free software application for creating solid 3D CAD (computer-aided design) objects. Developed by Clifford Wolf
License: Open Source
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 comprehensive solid modeling system primarily used for engineering and scientific applications, offering extensive geometric modeling techniques and powerful rendering capabilities. OpenSCAD, on the other hand, focuses on parametric modeling and scripting, making it ideal for users who prefer to define their models programmatically.