Jitsi
Jitsi is a group of free and open-source voice (VoIP), videoconferencing and instant messaging for many platforms, like the web platform, Windows, Linux, macOS, iOS and Android. The Jitsi project started with Jitsi Desktop (previously known as SIP Communicator). With the growth of WebRTC, the Jitsi team decided to focus on Jitsi Videobridge for doing web-based video calling for multiple people. Later the team added Jitsi Meet, a full video conferencing application that includes web, Android, and iOS clients. Jitsi also operates meet.jit.si, a version of Jitsi Meet hosted by Jitsi for free to be used by the community. Other projects are: Jigasi, lib-jitsi-meet, Jidesha, and Jitsi.