99Haskell-Problems-And-Real-Word-Haskell is a project mainly written in Haskell, it's free.
Solutions to 99Haskell problems and exercises in Real Word Haskell book
My attempt to learn haskell , has been greatly aided by the excersise problems in the book , Real World Haskell : http://www.realworldhaskell.org/blog/ and 99Haskell Problems : http://www.haskell.org/haskellwiki/H-99:_Ninety-Nine_Haskell_Problems
This repository has all my haskell programs for these problems.