Self-hosted social networks, forums and chat

A community on someone else's platform lives by that platform's rules. On a server of your own you set the rules and run the moderation, and through the fediverse or Matrix your members still reach people on every other server.

Mastodon, Pixelfed and Lemmy are fediverse servers: Mastodon for posts and follows, Pixelfed for photo sharing without algorithms, and Lemmy, an alternative to Reddit, for links and discussions. Synapse is a Matrix server you chat on from Element or any Matrix app. NodeBB is a forum, Apache Answer a Q&A site for a community, a help center or a team, and listmonk sends newsletters to your mailing lists.