Fast and portable XML parser and Jabber protocol library
http://code.google.com/p/iksemel/

iksemel is an XML (eXtensible Markup Language) parser library designed for Jabber applications.

 * Highly portable, builds on all POSIX environments and Windows (via mingw).
 * Suitable for embedded systems. Code is small and highly modular, you can trim unneeded parts. Memory usage is low, parser is quite fast.
 * Provides SAX, DOM and XMPP parsers.
 * TLS (via gnutls) and SASL support for XMPP security.
 * Only UTF8 encoding is built-in supported.
 * Fully documented with examples.