Forth operating system

http://www.forthos.org/

Cool stuff.

I know Forth is used in OpenFirmware because it's supposedly lightweight. Yet for its size/efficiency, I can't imagine the amount of time required to develop with it.

Have any /prog/riders used Forth in a non-trivial application?^[1] How was it compared to ...I was going to say ``similar'' languages, but maybe that's not the right word. How was it?

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_{[1] Perhaps a turnkey enterprise solution.}