BRL-CAD is described as 'Powerful cross-platform open source solid modeling system that includes interactive geometry editing, high-performance ray-tracing for rendering and geometric analysis, image and signal-processing tools, a system performance analysis benchmark suite, libraries for' and is a popular CAD software in the photos & graphics category. There are more than 50 alternatives to BRL-CAD for a variety of platforms, including Windows, Mac, Linux, Web-based and iPad apps. The best BRL-CAD alternative is FreeCAD, which is both free and Open Source. Other great apps like BRL-CAD are SketchUp, LibreCAD, Autodesk AutoCAD and SOLIDWORKS.