What other kinds of servers are on the Fediverse?

As well as Mastodon ⧉, there are lots of other server types on the Fediverse, for example: BookWyrm ⧉ – A social reading platform, an alternative to Amazon’s GoodReads Friendica ⧉ – A general social network with no character limits, sort of like Facebook used to be on its older interface Funkwhale ⧉ – Music and podcast storage and sharing Kbin ⧉ – Link aggregation and discussion, sort of like Reddit Mobilizon ⧉ – Event organisation, the Fedi’s alternative to Facebook Events ...