Freshmeat page: http://freshmeat.net/appindex/1999/07/20/932490892.html
The Free Association project is developing a Open Source, standards based calendaring and scheduling system. The project has goals to create a server and a client, but currently it is working on the core library, libical.
Libical is an Open Source implementation of the IETF's iCAL Calendaring and Scheduling protocols. The library parses iTIP components and provides a C API for manipulating the component properties and sub-components. It also has the rudiments of the CAP client/server protocol.
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!