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Personally, I have positive experiences using the #VideoConferencing software #Talky with my comics course.
They say it's for up to 6 people, but everything is going smoothly with 10+ participants from different platforms.
(One of the others is using it on her phone, though, and frequently gets kicked out of the chat.)
I've found it in the recommendations section of the #CryptoParty site.
(Next apocalypse I'll try #NextCloudTalk, though...)
