Threadiverse Catalog, by Catodon: go to the search page
Coverage is partial. Not every server or forum/community is indexed. What this means

Request removal

Ask for a forum, or a whole server, to be taken out of the catalog. This is also the way to report a forum that should not be listed.

A person reads every request; nothing is removed automatically. Once approved, the forum disappears at once and is never listed again. A server’s administrator can also opt out without asking anyone, with one line in robots.txt: see Opting out.

What should be removed?

For a forum: its handle as the catalog shows it (!name@server) or its https address. For a server: its name alone, such as example.org.

An email address or a fediverse handle, in case the reviewer needs to check that you run or moderate the forum. It is seen only by the reviewer and deleted as soon as the request is decided.

The catalog stores what you type here and nothing else about you: no address of your computer. Only a few requests per hour are accepted from one place.