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
Jitsi is a robust open-source video conferencing tool that excels in real-time communication, while Miranda IM is a lightweight instant messaging client that supports multiple protocols but is less focused on video capabilities. Jitsi is ideal for group video calls, whereas Miranda IM is better suited for text-based communication across various networks.