Freshmeat page: http://freshmeat.net/projects/vocal/
If you are interested in open source voice communications stuff, this is an excellent source. There are implementations co communication protocols applications built with them including stuff for SIP, MGCP, H.323, COPS, OSP, RTSP, VXML.
License: BSD like (http://www.vovida.org/About/license.html)
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!