#ActivityPub is used by a lot of #Fediverse software... #Mastodon, #Friendica, #Pixelfed, #PeerTube, #Pleroma, #Misskey, #Bookwyrm, #Lemmy, #GoToSocial and many more...
Many of them exists in variants like #Hometown, #Akkoma, #Calckey, #Firefish, #IceShrimp, etc.
And as #ActivityPub is an open protocol, you can start your own software, if you want... like #Mammuthus for example.
