Two Frank Sergeant implementations. Pygmy Forth: small, for IBM PCs, full source code. 3-instruction Forth for 68HC11, FORML 1991 with updates.

By Bureau d'Etudes (engineering and design department) Melice SPRL. ForthCAD-3D (French), 2D/3D Computer Aided Design software. ForthCAD-Pager (English), simple, accurate, reliable, low cost 2D editor, comes with new modular 3D CAD product line, evalu...

By Wolf Wejgaard Forth Engineering. New, Forth-based instant programming tool and interactive programming method that lets you build reliable programs in very little time; merges all parts of a powerful development tool: browser, editor, assembler, co...

Unofficial eForth for Linux 2.0.x and FreeBSD 2.0.5, using Wil Baden's pinhole optimizer.

By MicroProcessor Engineering, Ltd. Runs on Windows 9x/Me/NT/2000, targets embedded systems; VFX optimizing code generator on selected targets; flexible target memory management; standalone PowerForth target with its own compiler, interpreter.

Written in Java, so its interpreter can be embedded in a WWW HTML page and launched as an applet, to show that almost any programming language can be implemented in Java and not suffer unacceptable performance losses; documentation, downloads as a For...

Server-side web scripting engine based on Forth.

Very fast ANS standard Windows Forth. By MicroProcessor Engineering Ltd.

Free, full function demonstration version of Holon-86, which builds target programs on DOS platforms. You can use it for real programming.

Runs on Linux OS, similar to eForth. Goals: simple, easy to understand first, speed and elegance later; able to call functions (procedures) in dynamic linked library (.so files). Download, development forum.