Mod_virgule is the code used to drive Advogato, the free software developer's community resource. It's an Apache C module, and also requires glib and gnome-xml. The code is released under GPL, and is available in ghostscript.com CVS.
Please also see the mod_virgule project page on Advogato.
Note that the "virgule" project on SourceForge is a fork of the mainline codebase. It's pretty different than the codebase used to power this site.