I have seen FORTH used successfully in a few embedded systems. It's also a great language for doing initial hardware bringup (really easy to write functions th

I have seen FORTH used successfully in a few embedded systems. It's also a great language for doing initial hardware bringup (really easy to write functions that frob register-level stuff). In my experience it does not appear to scale very well to medium-sized projects (2-3 engineers for 3+ months). The best FORTH programmers I knew were pretty pragmatic about the language, and were frank about its limitations. The worst FORTH programmers thought it was totally wonderful for absolutely everything, which is of course a recipe for disaster with any language.