This is a "high-end" wiki system based on the Django framework for Python. Intention of this project was to write a transparent wiki system which allows direct editting of HTML on wiki pages.
Notice: Recent code is available on the Launchpad(!) project page: https://launchpad.net/aintnowiki/
Hatta is a wiki engine that uses a Mercurial repository for storing the pages. You can run it as a web application on your server, or locally on your computer. You can also do both, and synchronize the repositories once in a while.