Jitsi (formerly SIP Communicator) is a free and open source multiplatform voice (VoIP), videoconferencing and instant messaging application. Developed by University of Strasbourg (France), plus many others.
License: Open Source
qutIM is primarily a messaging app that excels in supporting multiple protocols and providing a customizable interface, while Jitsi is a robust video conferencing tool with high-quality audio and video capabilities, making it more suitable for virtual meetings and group conversations.