The Fediverse is more than Mastodon. Let’s get that straight away. Mastodon is just the most popular right now, because of the Twitter exodus.There are lots of other Fediverse platforms that are neat in their own right. And best of all, because of ActivityPub they all talk to each other!
Site has a lot of useful links that can save your fediverse bookmarks folder a lot of space.
Metrolist is petty good alternative if you liked ViTune. SimpMusic and Kreate are some other ones if metrolist doesn't interest you.