Ppl talk about nostr nests but I’ve never used it. I think there is a nip for groups too but I’m not sure what the current situation is.
Discussion
Satellite can be installed as a web app, and if you use something like Kiwi Browser with a signing extension (Android) or Nostore (iOS) you've got a powerapp for Nostr.
There is also https://zapddit.com/ which gives upvotes and downvotes as well as upzaps and theoretically downzaps though I see that greyed out rn. It's sorted into subs like n/memes and I notice that n/igger doesn't appear to be taken.