You can also try https://meet.jit.si/

Works directly in the browser (thanks to WebRTC), nothing to install, no need to create an accound.

There's group video chat, screen sharing, youtube video sharing, collaborative text editing,...

And it's free software :)

I just had a look at Jitsi and it seems like the Android app is in alpha stage, and that there won't be any iOS app (https://jitsi.org/Documentation/FAQ#ios). Smartphone apps are important to convince my contacts to make the switch, and to be able to communicate with them over the same channel when they're away from the computer.