Mastodon is an open-source communication & social tool — Self-hosted social networking server using ActivityPub; a federated alternative to X/Twitter.

Is Mastodon free and open source?

Yes. Mastodon is free and open source, released under the AGPL-3.0 license. You can view and contribute to the source at https://github.com/mastodon/mastodon.

What are open-source alternatives to Mastodon?

Other open-source communication & social tools on OSSDrop include Discourse, Rocket.Chat, Mattermost, Chatwoot.

Mastodon

Curated

Self-hosted social networking server using ActivityPub; a federated alternative to X/Twitter.

Visit joinmastodon.org Source

Communication & Social·AGPL-3.0·50.2k stars·v4.6.4·added 2026-07-26

Curated listing — added by OSSDrop, not the maker.

Frequently asked

What is Mastodon?
Mastodon is an open-source communication & social tool — Self-hosted social networking server using ActivityPub; a federated alternative to X/Twitter.
Is Mastodon free and open source?
Yes. Mastodon is free and open source, released under the AGPL-3.0 license. You can view and contribute to the source at https://github.com/mastodon/mastodon.
What are open-source alternatives to Mastodon?
Other open-source communication & social tools on OSSDrop include Discourse, Rocket.Chat, Mattermost, Chatwoot.

Discussion (0)

No comments yet.