Reva Forth is a free implementation of the Forth computer language for Windows, Linux and Mac.
Reva is based on RetroForth, which is modeled after CMforth, Colorforth, Eforth and Pygmy. It uses some, but not all, of Chuck Moore's newer ideas. It is currently targeted at the Intel x86 CPU family, and runs natively on Windows, Linux and Mac. There is now the beginning of an ARM version, currently targeting the Windows Mobile platforms.