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Filter by platform, license text, maturity, maintenance cadence, and editorial tags like privacy-focused or self-hosted. Search matches names, summaries, tags, and use cases.

Lemmy

Also strong

Link-aggregator and forum software using ActivityPub federation.

activitypubforumfederation

Federated social

Friendica

Honorable mention

Decentralized social hub bridging ActivityPub, diaspora*, and more.

federationactivitypub

Federated social

Mastodon

Top pick

ActivityPub microblogging server (fediverse flagship).

activitypubmicroblogging

Federated social

Pixelfed

Also strong

Federated photo sharing on ActivityPub.

photosactivitypub