Freshmeat page: http://freshmeat.net/projects/diri/
Diri is a minimalist wiki system, it is implemented less than 300 lines of rc shell scripts using Plan 9 from User Space and instead of a database uses a plain file system for storage. It uses markdown for formatting, supports edit preview and password protection.
This project has the following developers:
New HTML Parser: The long-awaited libxml2 based HTML parser code is live. It needs further work but already handles most markup better than the original parser.
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If you're a C programmer with some spare time, take a look at the mod_virgule project page and help us with one of the tasks on the ToDo list!