Wiki with a git-based backend. Feels like it serves static pages; written in Haskell.

A large number of advanced programming and computer science concepts explained using Haskell

A tutorial on writing shell scripts in Haskell. Demonstrates that Haskell code can be as idiomatic and quick to write as Perl; The exception and privilege separation handling code at the end is perhaps a bit excessive, but useful enough in itself as an illustration of good practices.

A large number of papers on the uses of monads in functional programming