Is this like Tumblr or something?

I think Misskey and its forks are among the Fediverse services that are not modelled on a specific commercial platform, but have created something completely their own.

The forks differ in details (see comparison), but the user experience is relatively similar.

Von Deinem Lemmy-Account aus kannst Du keinen Einzel-Accounts (wie z.B. Mastodon) folgen, nur Gruppenaccounts (wie Lemmy-Communitys, nbin-Magazines oder auch Peertube-Kanäle) abonnieren.

Von Mastodon aus kannst Du Deinem Lemmy-Account folgen. Dafür https://feddit.org/u/DNDnews oder @dndnews@feddit.org ins Suchfeld von Mastodon und dann folgen.

Communitys kannst Du auf die gleiche Weise abonnieren von Mastodon aus oder auch Lemmy-Beiträge dort liken oder teilen, indem Du deren URL ins Suchfeld kopierst.

Hubzilla (macroblogging service in the Fediverse) can also be used to create and collaborate on wikis.

I can only find a German-language manual for this right away: https://help.hubzilla.hu/benutzerhandbuch/wikis.html

Open Library is the main data source for Bookwyrm for book data. Bookwyrm is an application in the Fediverse that can be used to find and write reviews of books. I wouldn’t see that as a contradiction.

The article in the JoinFediverseWiki is very short. It could be expanded a little. I used to have an editor account for the wiki, maybe I’ll find the time to reactivate it.

Sharkey is also for microblogging but it also has some extra features, including user sites that can be used as a kind of blog and it “can play module / tracker music files - can play Flash (swf) - (federated) listenbrainz integration, …”

I haven’t tried these functions yet

Pinetta is under development: “A FOSS, federated, ActivityPub-enabled pinboard thingy, in the style of Pinterest.”. I don’t know anything else about it, but only discovered it on this list: delightful fediverse apps (“A curated list of server applications with support for the ActivityPub protocol (known as the fediverse) and related standards.”)