[birdsbolt]

There's also a compiler for Haskell to JavaScript called GHCJS[0]. Many of Haskell libraries can be compiled easily. I think someone compiled Pandoc directly to JS and made a web interface and bundled the app[2].

One interesting things besides web that people have been doing with it is writing Atom editor plugins[1].

[0]: https://github.com/ghcjs/ghcjs

[1]: http://edsko.net/2015/02/14/atom-haskell/

[2]: http://markup.rocks/