Portable Forth Environment
(PFE) A highly portable Forth development system based on the ANSI standard for Forth, by Dirk-Uwe Zoller of FHT, Mannheim, Germany. PFE aims to be correct, complete, usable, and simple but it isn't optimised for speed. It supports all dpANS word sets. It runs on Linux, RS/6000, and HP-UX.
Tektronix adopted PFE in 1998 and added modules and multithreading. You can load additional C objects at run time to extend the Forth dictionary. It can be targeted at different embedded environments by changing the terminal driver and initilisation routines.