nostr:npub18mft426uwj82ezzzmh36z2t5exl8fwc8fj7x0pcwkj9wq2het6zqzqurv2 Mastodon Bird UI in general, here's the list: https://github.com/ronilaukkarinen/mastodon-bird-ui#list-of-instances-that-use-mastodon-bird-ui

1.7.1rc7 I doubt is in use anywhere yet as I released it 3 minutes ago.