Elm: Functional Reactive Web Programming. Source + compiler/server now available
elm-lang.org
elm-lang.org
The Elm source code is available at github (https://github.com/evancz/Elm), and the compiler/server is available through Hackage (http://hackage.haskell.org/package/Elm).
See these install instructions (https://github.com/evancz/Elm/blob/master/README.md) to get Elm running on your machine. I have successfully installed on fresh copies of Ubuntu 11.10 and 12.04, Debian, and Linux Mint. Others have successfully installed with Win7 and OSX Lion. If you are having trouble that is not resolved by the install instructions, please ask me here and I'll do my best to help!
P.S. As of this release, Elm has support for ADTs (which explains the representation of strings).