[tor-dev] Haskell packages?

I'd like to improve my Haskell skills. Are there any opportunities? I've been told there is at least one project that uses Haskell, which is not maintained. (For example, this page [1] mentions TorDNSEL, which was replaced by TorBEL.) [1] https://www.torproject.org/getinvolved/volunteer.html.en