Mastodon, a twitter-like microblogging platform
Peertube, a peer-to-peer youtube-like video posting and streaming platform
Pixelfed, an instagram-like image sharing platform
Matrix, a federated IRC-style chatroom protocol (not really fediverse/activitypub, but still interesting)
Wafrn, a tumblr-like with support for Bluesky's AT protocol too!
Misskey, a unqiue social platform with lots of features, very popular with the Japanese art crowd
Mbin, another reddit-like with lots of interesting features and a nice interface.

And there are still plenty more that I haven't really tried yet! The fediverse is pretty huge!

As for recommending specific sites, that's a bit harder since it's healthy that not everybody is on the same server. So I would just recommend picking a reasonably popular server with open registration.

[–] Infrapink@thebrainbin.org 3 points 4 days ago (1 children)

mbin mentioned!

Also there's Sharkey, which is basically Misskey but in English.

Akkoma is like independent Misskey or something.

WriteFreely is a blogging platform.

[–] pseudo@jlai.lu 2 points 4 days ago

BookWyrm, reading tracker and review sharing

[–] meldrik@lemmy.wtf 4 points 4 days ago (1 children)

A small correction about PeerTube. It is not “torrent-based”.

[–] mrmaplebar@fedia.io 2 points 4 days ago

Alright, I've changed my description to "peer-to-peer".

[–] squirrel@piefed.kobel.fyi 16 points 4 days ago (1 children)

FediDB lists 67 software projects in the Fediverse. Just scroll through it and try whatever suits you.

My personal favorites:

PieFed (Threadiverse)
PeerTube (Videos)
Mastodon (Microblogging)
Bookwyrm (Books)

And lately I scrolled a bit through Wafrn, it's a whole different vibe over there. I don't understand much, but that's what I love about it.

[–] red_bull_of_juarez@lemmy.dbzer0.com 4 points 4 days ago (5 children)

Can you explain PeerTube? From what I gather, people set up their own instances for their stuff and no instance allows sign ups. So I need to create my own instance in order to even get a feed and notified of new posts?

Bookwyrm is nice, but it only knows about 20% of my Goodreads book shelf.

[–] rimu@piefed.social 13 points 4 days ago

PieFed can subscribe to peertube channels as if they were communities. https://piefed.social/f/peertube shows some of them.

[–] squirrel@piefed.kobel.fyi 5 points 4 days ago

There are a lot of instances that allow signups. Go to fediverse observer, filter by registration and country, order by active users and you'll get a decent list.

Or check one of these instances and request an account, just to name a few.

[–] klangcola@reddthat.com 4 points 4 days ago

You can subscribe to a peertube channel with a Mastodon account if you want

[–] meldrik@lemmy.wtf 4 points 4 days ago

Check out the pinned posts at !peertube@lemmy.wtf for an instance to register on and channels to follow.

[–] straddle@fedinsfw.app 1 points 4 days ago

And Lemmy has about 1% of Reddits users but here we are.

[–] ProdigalFrog@slrpnk.net 7 points 4 days ago* (last edited 4 days ago)

Lemmyverse.net is a very useful site to find communities that may not have federated to your instance yet (at least 1 user on your instance must be subscribed to it for it to begin federating). Especially useful for smaller instances.

[–] isidro_carle@lemmy.today 9 points 4 days ago

https://fedi.tips/

[–] discoplasm@piefed.zip 8 points 4 days ago (1 children)

i like NeoDB, it's handy for me to log movies/books/shows/music in one place

[–] Hiplobbe@lemmy.world 4 points 4 days ago

Cool, I didn't know about this. Thank you! :D

[–] birdwing@lemmy.blahaj.zone 3 points 4 days ago

You mean other federated sites? Mastodon, Friendica, PeerTube, to name a few.