Python Wikis
There are a bunch of them, some more like traditional wikis, other more like note-taking applications.
See - PythonTrac, PythonMoin
MS, Linux
Zim Wiki
http://zim-wiki.org/index.html
Excellent as PIM. Basically desktop with static HTML publishing.
WikidPad
http://en.wikipedia.org/wiki/WikidPad
http://wikidpad.sourceforge.net/
http://trac.wikidpad2.webfactional.com/
WikidPad is a wiki-like notebook for storing your thoughts, ideas, todo lists, contacts, or anything else you can think of to write down.
https://github.com/butscher/WikidPad
Security Incident at python.org
https://wiki.python.org/moin/WikiAttack2013
The python.org wikis for Python, Jython and the Python Software Foundation (PSF) were subject to a security breach and later attack which caused all of the wiki data to be destroyed on January 5 2013.
An analysis of the incident revealed that an exploit had been planted on our servers possibly as early as July 25 2012, which allowed arbitrary execution of code under the user running the MoinMoin wiki.
Also See
https://wiki.python.org/moin/PythonWikiEngines
https://wiki.python.org/moin/WikiCourse
https://wiki.python.org/moin/WikiLikeSyntax
Compare Trac Wiki to Moin - http://www.wikimatrix.org/compare/MoinMoin+TracWiki