@strypey It's definitely the interface that's my/the issue with Mumble. I will never get any non-nerdy friend to use this Windows 95 looking UI.
And my other issue is that unfortunately none of these alternatives provide the ease of joining a voice chat channel like Discord does: open an app, peek at your server to see whether your friends are online and join with a click if they are.
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@Datenproletarier Are you able and willing to run your own server? Or is your community willing to pay for managed hosting? If so, a @snikket_im server could be worth kicking the tires on. It can do voice/video and group rooms, and although I haven't tested group voice chat, 1:1 voice/video was excellent.
Full disclosure: Years ago I got paid to write copy for the Snikket.org site. But I recommend #Snikket only because it's 100% Free Code, decentralised (XMPP), and cool.