Fediverse.Party – Explore Federated Networks
This is a nice list of federated networks. Sadly, many of them look like ghost towns. A lot of them have home pages with marketing content but that don't show any easy way to get to network content. Others have content and links to founders profiles that haven't been updated in years. It's really hard to get excited about many of these when even the people building it don't seem to use it.