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Sup is a New Messaging App by the Creator of Pixelfed
(wedistribute.org)
A community dedicated to fediverse news and discussion.
Fediverse is a portmanteau of "federation" and "universe".
Getting started on Fediverse;
Does XMPP allow e2ee group video calls?
Yes, but its early days and only few clients support it. You can try it with Dino.