>
>  The just-barely complete, even-more-barely tested Macintosh
> implementation of Befunge is now yours.
>
> Type "befunge" (case doesn't matter) into the window, select the
> file you want to interpret, and enjoy.
>
> Chris Potter
>
> PS this program is built on top of Curtis Heilman's Pocket Forth --
> hence the name of the window and the icons.
>  ~ [source][1]

See Curtis Heilman's [Pocket Forth][2]

Compatibility
Architecture: 68k

should theoretically work on any valid Befunge source?

Not sure what category this one goes in:
Development Tools -for real? or Novelties & Fun?

  [1]: http://web.archive.org/web/19990219181617/http://www.frontiernet.net:80/~ccpotter/fungus.html
  [2]: http://macintoshgarden.org/apps/pocket-forth