gitit is a new kind of wiki, by John MacFarlane, based on git + pandoc + happs, and written in Haskell. The entire wiki may be edited either online, or offline via git.
The complete gitit system is now packaged for Arch, thanks to full HAppS support, and you can get it here. Hopefully we’ll see yet more HAppS-based web apps to follow, now they’re easy to distribute.
Arch Linux and Haskell 