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 an open-source video conferencing solution with a focus on privacy and customization, while ooVoo is a more user-friendly platform that offers higher-quality video and audio but comes with a subscription cost. Jitsi is ideal for tech-savvy users, whereas ooVoo caters to those seeking simplicity and ease of use.