Freshmeat page: http://freshmeat.net/projects/xmlboard
XMLBoard is an XML-driven multi-forum message board written in Perl. It stores its posts in XML format, and uses the Perl module XML::Parser to read them and show HTML to the users. It can be easily set up for several forums and several designs, with one administrator per forum. XMLBoard has other nifty features such as cookies to remember the users' names.
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!