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zoom alternatives
(lemm.ee)
If it's free and open source and it's also software, it can be discussed here. Subcommunity of Technology.
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the big ones out there are BigBlueButton and Jitsi. they have a lot of public instances, so you can easily check if they fit your needs.
where can i find some big blue button instances?
I only know German ones: senfcall.de or bbb.digitalcourage.de