Psi is a cross-platform powerful XMPP/Jabber client (Qt, C++) designed for the Jabber power users. Psi+ is a development branch of Psi IM XMPP/Jabber client. Developed by http://psi-plus.com/
License: Open Source
Kopete is known for its user-friendly interface and support for multiple chat protocols, making it accessible for general users. In contrast, Psi+ offers a more lightweight experience with advanced privacy features, catering to users who prioritize security and developer-friendly options.