brlcad  7.32.2
About: 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.
  Fossies Dox: brlcad-7.32.2.tar.bz2  ("unofficial" and yet experimental doxygen-generated source code documentation)  

brlcad Documentation

BRL-CADtm Application Programming Interface Documentation.

BRL-CAD is comprised of a collection of libraries, which organize a broad range of functionality relating to geometry and image processing.

TODO - need introduction/overview.