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So out of all these options for Haskell (http://www.haskell.org/haskellwiki/The_JavaScript_Problem), what's currently got the most momentum behind it?

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My impression is that Fay has been in (at least moderate) use the longest. GHCJS seems to be getting a lot more viable lately. Elm (which is only Haskellish rather than fully Haskell-compatible) isn't listed on that page, but is getting quite nice.

I usually hear that Haste produces the nicest target Javascript and GHCJS perhaps the worst... but GHCJS will probably continue to get more momentum.

Does anyone know of any well-known applications that are using any of the various Haskell -> JS convertors?

It's not useful information regarding the usefulness of this but I am curious.

Elm is a "Haskell-like" to JS compiler, and implemented in Haskell. It's used at Prezi [1], a company that was impressed enough by it to hire Elm's lead developer to work on the language there, and probably make use of it for their site.

[1]: https://prezi.com/

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