Freshmeat page: http://freshmeat.net/projects/neon/
neon is an HTTP and WebDAV client library with a C interface. neon features a high-level interface for using HTTP and DAV methods, and a low-level interface which allows the programmer to implement new methods quickly and easily.
neon supports persistent connections, basic and digest authentication, proxy servers (including authentication), and basic TLS/SSL (using OpenSSL). The WebDAV interface includes functions to easily retrieve property values, set or delete properties, as well as basic resource manipulation (move, copy etc.).
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!