@Shufei If you don't like XMPP you might be interested in nextcloud talk, chat over imap, or matrix.
Though poking around in the sqlite databases inside of zoom leads me to think they're using xmpp for at least part of it.
@alienghic I do wish Conversations was on other OS. Siskin is coming along. Trying out some new Linux soon.
@Shufei Sisken does look promising. I wonder if there's any decent Windows client.
I just found references to Psi and Gajim.
@alienghic Gajim is alright, once one figures out some UI eccentricity. None of this is really ready for non-geeks, though.
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