Hi all, The links below contain many suggestions (of which a percentage has already been mentioned in this thread). However I am putting the links here because there are a few more options inside. I guess there are many recent similar threads in many FLOSS lists/forums/other discussion platforms and similar posts/articles by many news sites/organizations/individuals.
Maybe this is an opportunity for FLOSS and privacy concerned solutions to be pushed to the wider public (though I doubt). https://anarc.at/blog/2020-03-15-remote-tools/ https://www.systemli.org/en/2020/03/15/solidarity-as-infrastructure.html https://sfconservancy.org/blog/2020/mar/17/remotetools/ https://www.fsf.org/blogs/community/better-than-zoom-try-these-free-software-tools-for-staying-in-touch https://en.wikipedia.org/wiki/Fediverse
