Flux is an extremely flexible and feature-rich toolkit library. The functionality includes a unithreaded event loop (which in many cases eliminates the need for multithreading or forking), network and file-serializable tree object structures, wrappers for expressing markup languages (like XML) in these tree structures, a validating XML parser (based on RXP at the moment), the beginnings of hashing and cryptography code, and more.
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!