Friendica

A federated social network server that lets people publish posts, messages and media on their own domain while exchanging content with other servers. It speaks ActivityPub, so an instance can follow users on Mastodon, Lemmy, Misskey, PeerTube and Pleroma, and can pull in WordPress and RSS feeds.

People run it to escape centralized feeds that profile their attention and to keep a personal archive of their own writing.

Hosting it yourself keeps the timeline and media on hardware you control, without a platform fee per account.