Code listed isn't necessarily complete or a usable product. The point is that the resource linked is mostly code and code that a beginner with a grasp of the basics could learn something from.
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https://github.com/bitemyapp/bloodhound Elasticsearch, mostly datatypes to describe Elasticsearch's query API and JSON parsing/generation.
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https://github.com/bitemyapp/blacktip Distributed k-ordered unique id service. Directly mimicking Flake which was itself based on Snowflake. Not correct/safe as I'm not using the system's monotonic clock.
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https://github.com/nikita-volkov somewhat advanced but pokes some interesting stuff
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https://gist.github.com/twopoint718/cac0bbe52fd5f0d3b1be Enumerates files in a directory and organizes them by file extension
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https://gist.github.com/bitemyapp/2311fcbfa152ce0980ed Filewriter example from the Haskell.org wiki I believe
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https://github.com/bitemyapp/shawty-prime This URL shortener written in Scotty is explained in detail in Haskell Programming
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https://github.com/thoughtbot/carnival Yesod app. Sort of an open source clone of Disqus.
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https://github.com/hlian/linklater library/framework
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https://github.com/twopoint718/spocks-brain example bot/app
- https://github.com/farnoy/chat frontend is coffeescript, but the backend is in Haskell