Reva Forth is a free implementation of the Forth computer language for Windows, Linux

Linux

Linux is a Unix-like computer operating system assembled under the model of free and open source software development and distribution. The defining component of any Linux system is the Linux kernel, an operating system kernel first released October 5, 1991 by Linus Torvalds...

 and Mac

Macintosh

The Macintosh , or Mac, is a series of several lines of personal computers designed, developed, and marketed by Apple Inc. The first Macintosh was introduced by Apple's then-chairman Steve Jobs on January 24, 1984; it was the first commercially successful personal computer to feature a mouse and a...

.

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

ARM architecture

ARM is a 32-bit reduced instruction set computer instruction set architecture developed by ARM Holdings. It was named the Advanced RISC Machine, and before that, the Acorn RISC Machine. The ARM architecture is the most widely used 32-bit ISA in numbers produced...

version, currently targeting the Windows Mobile platforms.