Inqlude provides a comprehensive listing of all existing libraries for developers of applications using the Qt toolkit. Inqlude is run by the community and open for contributions.
XMPP client and server library
QXmpp is a cross-platform C++ XMPP client and server library. QXmpp strives to be as easy to use as possible, the underlying TCP socket, the core XMPP RFCs (RFC3920 and RFC3921) and XMPP extensions have been encapsulated into classes and functions. QXmpp comes with full API documentation, automatic tests and numerous examples.