Based on ANSI Forth Standard, fully multithreaded, has module system, can load C objects at runtime to extend dictionary, best for embedded uses. Descriptions, history, links. [Open Source, LGPL]

Programming language and environment; implements large subset of ANS Forth, and extensions; can be standalone computing environment or object code can be linked to other programs to be a customizable language for that program.

The friendly Forth compiler/interpreter: detects virtually every error and reports what and where they occur, but is still fast and compact. Uses only signed 32 bit numbers. DOS, Windows, Unix.

A public-domain programming system for Mac OS X. It is a native code dialect of ANS Forth with significant enhancements to the OOP model employed in Neon/Yerk.

Three Jack J. Woehr implementations. JaxForth/Jax4th: ANSI Standard Forth for Amiga, Windows. VWin4th: 1994 tiny demo Forth written in Digitalk Smalltalk for Windows, source only. Also, author's book and many good links.

ANS compliant Win32 multithreaded Forth system. Released under GPL on SourceForge.

An expression used to convey an epiphany felt on the sudden manifestation of the essence of meaning of something. Heuristic architecture; holistic approach using hardware and software methods developed by Moore: descriptions of compiler, system, optim...

Forth systems for AVR, PIC and MSP430.

By HARDCODE Development; portable Forth development system for Motorola 680x0, supports ANSI; includes source, documentation, tools; free download.

Tom Almy's Forth compiler for x86 targets. Not interpreted: compiles to machine code (built-in assembler), written in Forth; very compact, fast, mature, stable.