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.
Forth-based, data-entry, data-base, screen-handling language. Automatically handles routine housekeeping that usually accounts for 90% of interactive application code. All Abundance programs can jaunt (run backward in time).
Native code, 32-bit Forth for Linux or Windows 95/98/NT/2000, with MINOS graphic user interface, and Theseus rapid GUI development editor. GPL, on SourceForge.
C version of ficl (Forth Inspired Command Language), runs on eCos OS; eCos and Forth can be small, ZOG is under 150K with author setup: i386, floppy booting. Includes source, floppy image downloads.