I only know German ones: senfcall.de or bbb.digitalcourage.de

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.

Has a mobile app!

+1 for DavX5 + nextcloud!

I wouldnt say thats normal … (at least here in germany).

Maybe consider using the isp device as modem only and use your own router?

Stating foss and not even linking the source is … hmm

For my taste way to many crypto bro/blockchain products listed. Also some very controversal apps with no comment on the contoversy.

Maybe you could improve that a bit :)

Nothing realy exept licencing

Maybe consider using forgejo (gitea fork used by codeberg)

And i do think, some changes would be needed but nothing big, also it wouldnt ne activated by default.

Despite you using the foss client of telegram there is no source for the server, signal has published it’s code.