Building Block Software, Inc. has released a free source edition of its CAD/CAM Developer's Kit product line, a series of C-function libraries for developing CAD, CAM and CNC applications. These libraries provide the mathematical "building blocks" necessary for toolpath, boundary off-set, area boolean and other calculations.

The source code can be used with any operating system with a C compiler, including Windows, Linux and Apple OS X and all forms of Unix. The kit functions may also be called in Windows from C# through a DLL interface.