From Rosetta Code
BigFORTH is an implementation of Forth. Other implementations of Forth.
BigFORTH is an example of a compiler. You may find the programming tasks that have been solved using it here.

bigFORTH (executable name bigforth) is an interpreter and x86 optimizing compiler of the Forth language by Bernd Paysan. It has implementations for Linux and Windows (pre-beta). It obeys the ANS standard and comes with many libraries and bits of sample code, including a complete GUI framework called MINOS, and a form editor, Theseus.