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- product Discourse GPLv2 forum and community platform. Topics, trust levels, and email you host — not Discourse Cloud, GitHub Discussions, or a Circle seat.
- product Flarum MIT forum software. flarum/flarum is the project skeleton; flarum/framework is the PHP code (last push 24 Oct 2026). A lighter forum you host — not Discourse Cloud.
- product Lemmy AGPL-3.0 federated link aggregator written in Rust. Communities, posts, and votes you host — not a Reddit awards seat.
- product Mastodon AGPL-3.0 self-hosted, federated microblogging. An ActivityPub server for a community you operate instead of a vendor timeline.
- product Misskey AGPL-3.0 federated microblogging platform (ActivityPub). A Misskey instance is a community you host, not a Twitter clone SKU.
- product NodeBB GPL-3.0 Node.js forum software. A modern-web forum you host — not Discourse Cloud or GitHub Discussions.
- product PieFed AGPL-3.0 Python threadiverse server (Codeberg rimu/pyfedi — not a GitHub repo). A Reddit-shaped community you host.
- product Pixelfed AGPL-3.0 federated photo social network. Posts, follows, and stories you host — not an Instagram Reels or Shop seat.