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 (RFC6120 and RFC6121) and XMPP extensions have been encapsulated into classes and functions. QXmpp is ready to build XMPP clients complying with the XMPP Compliance Suites 2020 for IM and Advanced Mobile. It comes with full API documentation, automatic tests and some examples.