Freshmeat page: http://freshmeat.net/projects/quark/
Quark is an audio player, for geeks, by geeks. It runs in the background with access provided via a FIFO in the filesystem. It uses Xine-lib for playing music, and can therefore play any file format supported by Xine.
Quark comes with a couple front-ends to make it more useful.
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!