The lead developer of Fedilab has a new project called Fedvice:
It's a database for keyword searches of Fediverse instances (including Mastodon, Pleroma, Friendica, PixelFed, PeerTube).
-You can get suggestions by messaging Fedvice with hashtags
-You can add an instance by messaging Fedvice with an instance URL and some hashtags
-You can also remove your data by messaging it with the word "delete"
It's an open source project, the source code is here: