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
OpenMeetings excels in providing a comprehensive set of features aimed at collaboration and education, allowing extensive customization and integration. In contrast, Jitsi is a lightweight option that prioritizes privacy and ease of use, making it ideal for quick meetings without complicated setups.