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Buggy C language implementation of my BIF 6809 variant of fig-FORTH. May be interesting to programmers with C background who want to understand the high-level version of the low-level of FORTH. Those requiring a functioning FORTH should look elsewhere.
(The releases are usually out of date. Best to browse the code repository and download the latest snapshot.)
There is now a basic how-to to get you started in the [wiki].
(The OSDN mirror at http://sourceforge.jp/projects/bif-c/ is becoming inaccessible.)