Anafabula
KDE connect can do that if they are on the same network
They have been working on the local translation stuff since 2019, long before they started talking about AI recently
keys.openpgp.org is the one that Thunderbird uses and I don't think that can be changed
Misskey or one of it's many forks is good too
You can view threads without logging in? I haven't been able see replies/parent posts in months.
Except with Nitter, but that had to shut down too.
Mastodon users can post to Lemmy communities by mentioning the Community ( !KDE@lemmy.kde.social in this case). That allows Lemmy users to comment on it.
It's just been merged to master for NixOS. Next stable would be 24.05
https://github.com/NixOS/nixpkgs/pull/286522
https://nixpk.gs/pr-tracker.html?pr=286522