Freshmeat page: http://freshmeat.net/projects/plan9/
Developed by the people who devised UNIX, and C, Plan 9 takes OS development back into the realm of research. Plan 9 is an attempt to work on the concept of operating system from the ground up, reworking the whole idea using modern concepts and technology.
License: Lucent Public License version 1.02
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!