Similar in purpose to this one: finding the right community for you (but with no commentary on how active they are)

https://lemmy.ml/c/findacommunity

https://lemmy.ml/c/newcommunities@lemmy.world

https://lemmy.ml/c/communities@midwest.social

https://lemmy.ml/c/communities

https://lemmy.ml/c/find_a_community@lemmygrad.ml

https://lemmy.world/c/newcommunities

https://lemmy.ml/c/helpmefind

ANNOUNCEMENTS and PROMOTED DISCOVERY:

https://feddit.de/c/ankuendigungen (Announcements - German)

https://lemmy.ca/c/communitypromo

https://lemmy.ca/c/wowthislemmyexists