dejafu (hackage): [Déjà Fu is] A martial art in which the user's limbs move in time as well as space, […] It is best described as "the feeling that you have been kicked in the head this way before" -- Terry Pratchett, Thief of Time  This package builds on the concurrency package by enabling you to deterministically test your concurrent programs.  See the website or README for more.
Keywords: concurrency|library|mit|haskell|testing