Things on this page are fragmentary and immature notes/thoughts of the author. Please read with your own judgement!
Appear.in seems to be a good one and easy to use.
Talky: Provides both video and screen sharing using WebRTC. Cisco Spark: Create rooms for video calling, group messaging and sharing. Appear.in: Group video calling for up to eight people. Jitsi Meet: Group video calling and screen sharing using WebRTC.