LibreCAD is a free Computer-aided design (CAD) application for 2D design. It works on Linux, OS X, Unix and Windows operating systems. Developed by Ries van Twisk
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 CAD tool that excels in 3D modeling and rendering, making it suitable for complex design tasks, while LibreCAD focuses on 2D drafting with a user-friendly interface, making it ideal for simpler design projects. In contrast, BRL-CAD offers advanced scripting and customization features, whereas LibreCAD provides better collaboration tools and cloud integration.