Free, 32-bit, direct threaded Forth compiler for x86. Other processors to be supported. Explanations, source files. ANSI Standard Forth for Amiga, Windows. Also, author's book and many good links.
Site has links, programs, history.
Was sold commercially by Delta Research. The only programming system for Windows NT kernel mode device drivers. Write kernel mode device drivers, interactively, in hours instead of days. Binary file works on all Linux versions since 1.2. And Forth software, books, links.