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 tool that emphasizes customization and flexibility, while Wickr is a secure messaging platform focused on privacy and self-destructing communications. Both offer encryption, but they cater to different use cases, with Jitsi being more suited for meetings and collaboration, and Wickr for secure messaging.