It’s been like 5 weeks since this part of the fediverse really started growing after a long time of relative stagnation, so I don’t think hardly anything except lemmy and kbin themselves.

More stuff has a home over on mastodon, because it’s been a lot longer since the exodus over there.

edit: But on kbin you should be able to follow their accounts from mastodon, I believe.

apart from the communities for fediverse clients, here are some with more than 1k subscribers (as seen on https://lemmyverse.net/communities):

!fdroid@lemmy.ml

!jellyfin@lemmy.ml

!emacs@lemmy.ml

!firefox@lemmy.world

!git@programming.dev

!protonmail@lemmy.ml

!tor@lemmy.ml

!newpipe@lemmy.ml