Flarum
Delightfully simple forums. Flarum is the next-generation forum software that makes online discussion fun again.
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Source code
Other self-hosted communication - social networks and forums
Federated microblogging server with Mastodon, GNU social, and ActivityPub compatibility.
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Run it with Docker
Spin up Flarum on a VPS in minutes. Use the docker-compose generator to get a starter snippet, or grab a server below.