Hi folks, As an educational project a few years back I started working on an interpreter for the MUMPS language in Haskell. It's got a REPL and can call into functions defined in external files. It doesn't support a lot of the built-in-functions, nor does it have support for on-disk persistent variabls (globals, in MUMPS speak). But it's on Hackage, in case anyone else is pervers enough to be interested in such a thing. I started it a few years back, so I wouldn't say it has an ideal structure. But it was surprisingly easy to come back to it and extend the parser/runtime in the past few weeks. hackage link: http://hackage.haskell.org/package/hmumps MUMPS wikipedia link: http://en.wikipedia.org/wiki/MUMPS Feedback is appreciated. Antoine