Haskell's community is a bit more thoughtful and less prone to self-promotion. That combined with the fact that you're not a Haskeller, you're not familiar with what they've built.

Another issue is that Haskell is somewhat weighted towards finance and they're a bunch that tends to be somewhat proprietary about their IP. Some exceptions (Ermine) exist.

Some notable projects that come to mind include git-annex and Parsec. Parsec has been preeminent parser-combinator library since forever.

Also: pugs, pandoc, gitit, Darcs, xmonad, Idris (same person that did whitespace, haha)

Recently? Cryptol. That's pretty major.

I'm building stuff in Haskell, right now. Specifically, the easiest to use Elasticsearch client in the world.

One was needed. Badly. The ES API's data structures were never specced out properly, just documented on an ad-hoc basis. The Haskell library I'm working on will, if nothing else, mean that there's a reference for how the JSON is structured.

Anyway, empower thyself, learn some Haskell: https://gist.github.com/bitemyapp/8739525

Edit:

Ah, I thought I knew that username from somewhere. The negative-nancy is Timothy Baldridge, an employee of Rich Hickey's company Cognitect. Cognitect is "the" Clojure company and represents the inner-clique.