tracwiki-mode is a major mode for working with Trac, a popular “open source web-based project management and bugtracking system”. I got tired of working with it in the browser, and sat down and figured out how to build a major mode.
I did! However, large parts of it are inspired by / lifed from Markdown Mode.
GPLv2.
The current path is to finish fleshing out the Trac syntax, and then from there the goal is to work in xml-rpc integration so you don’t ever have to leave the world’s best text editor just to browse something as simple as a wiki ;)