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Re:Reflecting on Haskell in 2017 by harry8 on Monday December 04, 2017 @02:28AM (#15842162)
For sure warp would seem to count!

https://hackage.haskell.org/package/warp

Re:Reflecting on Haskell in 2017 by hood_syntax on Monday December 04, 2017 @09:45AM (#15844159)
If you're curious, there's a piece on Warp in the Architecture of Open Source Applications.

http://aosabook.org/en/posa/warp.html