http://www.scn.org/~mentifex/mind4th.html is the Forth "killer app."
"David N. Williams" wrote on Tue, 23 Apr 2002:
> I've been following a thread in sci.math.symbolic
> which wrangles about the virtues of Lisp vs. C++
> for writing computer algebra programs. It's been
> mentioned in c.l.f. quite a bit that Lisp has a
> lot in common with Forth, especially in matters
> of practise. It's easy to find discussions on
> why and how to use Lisp where "Forth" could be
> substituted, and we'd all feel right at home.
http://mind.sourceforge.net/lisp.html = "Lisp for AI".
>
> Here's an article mentioned in the s.m.s discussion
> that I found to be an interesting sidelight on the
> frequent discussions here about the need for a killer
> app, by Paul Graham (author of "ANSI Common Lisp"),
> called "Beating the Averages":
>
> http://www.paulgraham.com/avg.html
>
> He explains why he kept it a secret that his killer app was
> written in Lisp, and it wasn't because he was afraid of the
> stigma of a niche language!
>
>More of his articles are here:
>
> http://www.paulgraham.com/articles.html
>
>Maybe his stuff was already mentioned in this group, but I don't
>remember it, so here it is...
>
>-- David