FreeWPC provides development tools and a software framework for 1990's Bally/Williams pinball machines. The framework allows you to build your own ROM images, defining your own game rules, dot matrix animations, lamp shows, etc.

FreeWPC is also a generic pinball development platform that can be used as the basis for new machines. The code is portable to different processors; as long as there is a GNU C compiler for it, FreeWPC can target it.