mathstodon.xyz is one of the many independent Mastodon servers you can use to participate in the fediverse.
A Mastodon instance for maths people. We have LaTeX rendering in the web interface!

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@j_bertolotti I used Jitsi and BigBlueButton a lot during lockdown and it worked much better than what people sometimes say. But of course the server needs to have been properly sized. I still use both when I am given the choice (ie not sent a zoom url). In France, Renater still has a good Jitsi instance, and CNRS a BBB instance.

@j_bertolotti 2020: Zoom pulls a Skype (2003).

2024: Zoom pulls a Skype (2020).