*W3 Quote:* "The ActivityPub protocol is a decentralized social networking protocol. It provides a client to server API for creating, updating and deleting content, as well as a federated server to server API for delivering notifications and content."
*Shlee Quote:* "ActivityPub is the idea of splitting online services into tiny self hosted pieces - Turning privately owned services like twitter into thousands of little twitters, who are able to communicate with each other as you would expect - Giving power and control back to the many."
> Alice is on Server A. Bob is on Server B. Alice sends a message to Bob. Server A sends the message to Server B. Bob gets notified of the message. :star:
*  [Mastodon](https://github.com/tootsuite/mastodon) - _Ruby_ "Mainstream reference design"
*  [glitch-soc](https://github.com/glitch-soc/mastodon/) - "A glitchy but lovable fork"
*  [mastodo](https://github.com/gled-rs/mastodo) - "Implementing useful features not implemented upstream"
*  [Pleroma](https://pleroma.social/) - _Elixir/Erlang_ "High Performance with seperated BE/FE design"
*  [Misskey](https://github.com/syuilo/misskey) - _NodeJS_ "forever evolving, sophisticated microblogging platform" with lots of anime girls.
*  [Nextcloud Social](https://github.com/nextcloud/social) - _NodeJS_ "Nextcloud becomes part of the federated social networks!"
*  [PeerTube](https://github.com/Chocobozzz/PeerTube) - _NodeJS_ "Video streaming platform using P2P (BitTorrent) directly in the web browser with WebTorrent and Angular."
*  [Soundstorm](https://github.com/weathermen/soundstorm) - _Ruby_ "Federated Social Music Platform."
*  [Reel2Bits](https://github.com/rhaamo/reel2bits) - _Python_ "Soundcloud-like but simple, easy and KISS (and ActivityPub)"
*  [Pump.io](https://github.com/pump-io/pump.io) - _NodeJS_ "Social network"
*  [Distbin](https://github.com/gobengo/distbin) - _NodeJS_ "Post bin with distributed social features."
* [Anancus](https://gitlab.com/tuxether/anancus) - _Go_ "self-hosted and federated social link aggregation."
* [Hubzilla](https://framagit.org/hubzilla/core) - _PHP_ "powerful platform for creating interconnected websites."
*  [Dokieli](https://github.com/linkeddata/dokieli) - _NodeJS_ "decentralised article publishing, annotations and social interactions."
*  [Aardwolf](https://github.com/Aardwolf-Social/aardwolf) - _Rust_ "Powering connected social communities"
*  [MeowCat2](https://github.com/cabalamat/meowcat2) - _Python_ "federated blogging and social networking platform"
*  [Lemmy](https://github.com/dessalines/lemmy) - _Rust_ "federated alternative to reddit"
*  [socialhome](https://github.com/jaywink/socialhome) - _Python_ "federated personal profile"
*  [MobiliZon](https://github.com/framasoft/mobilizon) - _Elixir_ "federated organization and mobilization platform. Gather people with a convivial, ethical, and emancipating tool."
*  [Littr.me](https://github.com/mariusor/littr.go) - _Go_ "Link aggregator inspired by reddit"
*  [Lamia](https://github.com/Scarly-Cat/lamia) - _Python_ "Distributed blogging, polls, and status updates powered by activitypub, python, the gay agenda, and snake women."
*  [Anfora](https://github.com/anforaProject/anfora) - _Python_ "photo gallery social network"
*  [Pubcast](https://github.com/pubcast/pubcast) - _Go_ "experimental ActivityPub based podcasting platform"
*  [Fedimos](https://github.com/fedimos/server) - _NodeJS_ "End-to-End Encrypted & Decentralized Messaging Service for the Fediverse"
*  [Little Boxes](https://github.com/tsileo/little-boxes) - _Python_ "both database and server agnostic."
*  [PubGate](https://github.com/autogestion/pubgate) - _Python_ "Lightweight (Gotta Go Fast) ActivityPub federator."
*  [Clovis](https://github.com/WellFactored/clovis) - _Scala_ "totally a hobby project to learn new stuff at the moment so don't expect much"
* [RSS to ActivityPub Converter](https://github.com/dariusk/rss-to-activitypub) - NodeJS - Convert any RSS feed to an ActivityPub actor that can be followed on ActivityPub-compliant social networks like Mastodon
* [The “Worse Is Better” Approach to Federated Social Networking](https://blog.dereferenced.org/activitypub-the-worse-is-better-approach-to-federated-social-networking) - by Kaniini (lead developers of Pleroma).
