Freshmeat page: http://freshmeat.net/projects/rasqal/
An RDF query library in C that can parse the RDQL and SPARQL RDF query languages, manipulate the queries via API, and execute them against RDF graphs. Rasqal can use raptor or redland to provide a data source for querying and is designed to integrate with Redland, but is separate from it. Raptor is under development and not stable yet but is very fast and has no memory leaks.
License: LGPL / GPL / Apache2
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!