Franchise is primarily written in Ada 2005, and uses OpenGL 2.1 for graphics rendering. The operating system front-ends are written in languages apropriate to their environments (C, C++, Objective-C).
Linux, Mac OS X, and Windows builds are provided. The code includes an experimental Haiku front-end, but it is unsupported until there is a viable Ada compiler on that platform.
Franchise is free (as in speech) software and the complete source code is included with the game. You are free to modify and redistribute it as you wish.