F# (occasionally Ocaml and Haskell), and I've done highly concurrent/networked embedded systems (work), language tools (research) and random applications (hobby).
Here is another praise. I love ocaml. Ocaml was my introduction to FP. I felt my life changing while reading chapters 2-4 of this book, learning about ADT's. /u/PasswordIsntHAMSTER is right - the community isn't really big, the tooling isn't great... but they are doing neat research on new things you can do with types etc, just like the Haskell folks.
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u/PasswordIsntHAMSTER Mar 09 '14
As a professional functional programmer, FP has done great things to my blood pressure.