Nostr.watch runs monitors that are publishing statistics for all relays that it finds. So, that's a lot of relays you can just pull up stats for. It's really cool because this solves one of nostr's decentralized relay directory problems with NIP66. I made a short video about it.

nostr:nevent1qvzqqqqqqypzqlxr9zsgmke2lhuln0nhhml5eq6gnluhjuscyltz3f2z7v4zglqwqy2hwumn8ghj7un9d3shjtnyv9kh2uewd9hj7qg3waehxw309ahx7um5wgh8w6twv5hsqg9vatr0chgl5wkgnh6qukl890w7pkdmalmd95mfqxu283ak5s4rtv505dzz