* :heavy_check_mark: **[Aardwolf](https://github.com/Aardwolf-Social/aardwolf)** ([site](https://aardwolf.social)): Facebook-like social network connecting communities across the web `AGPL-3.0, Rust`
* :tada: :heavy_check_mark: **[Dolphin](https://github.com/syuilo/dolphin)**: Lightweight ActivityPub Server optimized for single-user. A fork and sister project of Misskey `AGPL-3.0, Javascript`
* :tada: :heavy_check_mark: **[Ecko](https://github.com/magicstone-dev/ecko)** ([Fedi account](https://c4.social/@weex)): A fork of Mastodon to optimize toward community, that is making it as easy as possible to contribute `AGPL-3.0, Ruby`
* :tada: :heavy_check_mark: **[Epicyon](https://gitlab.com/bashrc2/epicyon)** ([site](https://epicyon.net)): ActivityPub server implementing S2S and C2S protocols, suitable for single board computers. Includes features such as moderation tools, post expiry, content warnings, and image descriptions `AGPL-3.0, Python`
* :tada: :heavy_check_mark: **[Friendica](https://github.com/friendica/friendica)** ([site](https://friendi.ca)): Personal network that helps to keep in contact with friends. Interface and functionality include common features of a mainstream social network `AGPL-3.0, PHP`
* :tada: :heavy_check_mark: **[groundpolis](https://github.com/xeltica/groundpolis)**: A microblogging service forked from Misskey `AGPL-3.0, Typescript`
* :tada: :heavy_check_mark: **[Glitch-soc](https://github.com/glitch-soc/mastodon)** ([site](https://glitch-soc.github.io/docs), [Fedi account](https://friend.camp/@darius)): A friendly fork of Mastodon, with the aim of providing additional features at the risk of potentially less stable software `AGPL-3.0, Ruby`
* :heavy_check_mark: **[GoToSocial](https://github.com/gotosocial/gotosocial)** ([Fedi account](https://ondergrond.org/@dumpsterqueer)): A headless Mastodon-compatible Fediverse server project, written in Golang. `AGPL-3.0, Go`
* :tada: :heavy_check_mark: **[Hometown](https://github.com/hometown-fork/hometown)** ([Fedi account](https://friend.camp/@darius)): A fork of Mastodon that provides local posting and a wider range of content types `AGPL-3.0, Ruby`
* :tada: :heavy_check_mark: **[Honk](https://humungus.tedunangst.com/r/honk)** ([Fedi account](https://honk.tedunangst.com/u/tedu)): ActivityPub server with minimal setup and support costs `ISC, Go`
* :heavy_check_mark: **[Jejune](https://github.com/kaniini/jejune)** - A work-in-progress ActivityPub server designed to use constructions which provide functional security and resilience `ISC license, Python`
* :heavy_check_mark: **[Kepi](https://gitlab.com/marnanel/chapeau)** ([Fedi account](https://queer.party/@marnanel)): A Django-based microblogging server, written in Python, which supports the Mastodon protocol. `GPL-2.0, Python`
* :tada: :heavy_check_mark: **[Ktistec](https://github.com/toddsundsted/ktistec)** ([Fedi account](https://mastodon.social/@toddsundsted), [site](https://epiktistes.com/@toddsundsted/)): A single-user ActivityPub server with minimal dependencies, using SQLite, [server](https://epiktistes.com) `AGPL-3.0, Crystal`
* :heavy_check_mark: **[lectrn](https://github.com/lectrn/lectrn)** ([site](https://lectrn.com/)): A social network for humans that is free, decentralized, open, and easy to use. `AGPL-3.0, Javascript`
* :heavy_check_mark: **[mammoth](https://gitlab.koehn.com/mammoth)** ([Fedi account](https://mammoth.home.koehn.com/api/actor/bkoehn)): A federated social media platform implementing the ActivityPub specification for client/server and server/server communications. `AGPL-3.0, Typescript`
* :tada: :heavy_check_mark: **[Mastodon](https://github.com/tootsuite/mastodon)** ([site](https://joinmastodon.org)): Epic microblogging network with many features and multiple interface layouts to choose from `AGPL-3.0, Ruby`
* :heavy_check_mark: **[MatticNote](https://github.com/MatticNote/MatticNote)**: ActivityPub compatible SNS that aims to be easy for everyone to use. `AGPL-3.0, Go`
* :heavy_check_mark: **[microstatus](https://github.com/Arkanosis/microstatus)**: Lightweight Mastodon and GNU Social-compatible server implementation `ISC, Rust`
* :tada: :heavy_check_mark: [**Misskey**](https://github.com/misskey-dev/misskey) ([site](https://join.misskey.page/en)): Sophisticated microblogging with personality. Provides many additional features like calendar, emoji reactions, polls, games, and many other widgets `AGPL-3.0, Javascript`
* :tada: :heavy_check_mark: [**Mistpark 2020**](https://codeberg.org/zot/misty/) aka 'misty' ([site](https://zotlabs.com/misty), [Fedi account](https://macgirvin.com/channel/mike)) - A webserver app that supports AP and Zot protocols, fork of Zap `CC0-like, PHP`
* :heavy_check_mark: [**Osada**](https://codeberg.org/zot/osada) - a full featured social network application. Old [repo](https://framagit.org/zot/osada) abandoned by the developer in March 2019; recently moved to new repo
* :tada: :heavy_check_mark: [**Roadhouse**](https://codeberg.org/zot/roadhouse) ([site](https://zotlabs.com/roadhouse), [Fedi account](https://macgirvin.com/channel/mike)) - Next gen Fediverse server `CC0-like, PHP`
* :tada: :heavy_check_mark: **[Smithereen](https://github.com/grishka/Smithereen)**: VKontakte-like social network, with friends, walls, photo albums and groups `Unlicense, Java`
* :tada: :heavy_check_mark: **[SocialHome](https://git.feneas.org/socialhome/socialhome)** ([site](https://socialhome.network)): Personal webpage with social networking functionality `AGPL-3.0, Python`
* :tada: :heavy_check_mark: [**Socialtap**](https://git.feneas.org/socialtap/server): drink socially! A federated version of Untappd.com. It [extends](https://socialtap.git.feneas.org/vocab) the ActivityPub types `GPL-3.0, Go`
* :heavy_check_mark: [**Spritely**](https://gitlab.com/spritely) ([Fedi account](https://octodon.social/@cwebber)): Research space for a next-gen distributed social network written in Racket and consisting of multiple projects, by AP specification co-author Christopher Lemmer Webber. `Apache-2.0, Racket`
* :tada: :heavy_check_mark: **[Tavern](https://gitlab.com/ngerakines/tavern/-/tree/release-amber-ale)** ([Fedi account](https://mastodon.social/@ngerakines)): A minimalistic Activity Pub server. Think Mastodon, but smaller and with fewer features `Go, MIT`
* :black_nib: **[Vagabond](https://github.com/CameronWhiteCS/Vagabond)** ([site](https://stable.teamvagabond.com/)): A federated social network built with security and privacy in mind. `GPL-3.0, Python`
* :tada: :heavy_check_mark: [**Zap**](https://codeberg.org/zot/zap) ([site](https://zotlabs.com/zap/), [Fedi account](https://z.macgirvin.com/channel/mike)): A webserver app that supports AP and Zot protocols `CC0-like, PHP`
* :ghost: [**fed**](https://github.com/kissen/fed): Trying to be a basic twitter-like service that works with ActivityPub. Based on [Go-Fed](https://go-fed.org) `GPL-3.0, Go`
* :ghost: [**GangGo**](https://git.feneas.org/ganggo/federation/issues/17) - Seems to have settled on using [Go-Fed for AP federation](https://git.feneas.org/ganggo/activity). Developer has suspended development for the foreseeable future
* :ghost: **[Kibou](https://git.cybre.club/kibouproject/kibou)**: Lightweight social networking server that implements Mastodon's REST API. `AGPL-3.0, Rust`
* :ghost: [**MrBotchi**](https://github.com/mrbotchi-team/mrbotchi) ([Fedi account](https://norimono.moe/@silverscat_3)): A federated microblogging platform for single-user - not updated since June 2020 `AGPL-3.0, Go`
* :ghost: [**Pylodon**](https://github.com/rowanlupton/pylodon) - Flask-based (Python) ActivityPub server , [source code also on GitLab](https://gitlab.com/rowanlupton/pylodon), no updates on either repo for about a year, nor on their [Smilodon client app](https://github.com/rowanlupton/smilodon)
* :ghost: [**Smilodon**](https://gitlab.com/tuxcrafting/smilodon) (server by Tuxcraft) - abandoned by developer "I'm now [working on Sminos](https://gitlab.com/tuxcrafting/sminos/issues/1) and so this will probably be 100% abandoned. There's not much to salvage, its code is cancer." Sminos appears to have never got beyond the initial commits
* :ghost: **[Technopolis](https://github.com/technopolis-microblog)** ([site](https://technopolis.app/), [Fedi account](https://norimono.moe/@silverscat_3)): A globally interconnected micro-blogging platform inspired by Misskey - not updated since December 2020 `AGPL-3.0, Rust`
* :ghost: [**un chapeau**](https://gitlab.com/marnanel/un_chapeau/-/issues/17): Server for the Mastodon protocol, implemented in Django. Latest commit - May 2019. `AGPL-3.0, Python`
* :heavy_check_mark: **[GoBlog](https://git.jlel.se/jlelse/GoBlog)** ([site](https://goblog.app/), [Fedi account](https://fosstodon.org/@jle)): Simple blogging system written in Go `MIT, Go`
* :heavy_check_mark: **[Hubzilla](https://framagit.org/hubzilla)** ([site](https://hubzilla.org)): CMS with a range of groupware tools available as plug-ins `MIT, PHP`
* :heavy_check_mark: **[Little Library](https://github.com/Alamantus/little-library)**: A digital give-a-book, take-a-book library for ebooks. `AGPL-3.0, Javascript`
* :heavy_check_mark: **[Read.as](https://github.com/writeas/Read.as)** ([site](https://read.as)): Reading app by the devs of WriteFreely `AGPL-3.0, Go`
* :black_nib: **[Stringer](https://codeberg.org/Stringer/stringer-web)** ([site](https://stringer.blog/), [Fedi account](https://mastodon.social/@stringerblog)): A blogging platform for the decentralized web. `GPL-3.0, PHP`
* :heavy_check_mark: **[WordPress](https://git.feneas.org/feneas/fediverse/-/wikis/Wordpress-integration-with-Fediverse)** - [listed as a project on the-federation.info](https://the-federation.info/wordpress). [AP plug-in](https://wordpress.org/plugins/activitypub) by @pfefferle@mastodon.social, that allows users on AP apps to follow WP blogs, and comment on them, from an AP app
* :ghost: [**Lamia**](https://github.com/Scarly-Crow/lamia): Distributed blogging, polls, and status updates powered by activitypub, python, the gay agenda, and snake women. `AGPL-3.0, Python`
* :ghost: [**NoteIn**](https://github.com/notein/NoteIn): No commits since October 2018
* :black_nib: **[Flarum](https://github.com/squeevee/flarum-ext-feddle)**: Experimental plugin for [Flarum](https://flarum.org/) forum software by [@squeevee](https://yiff.life/@squeevee/102496777538790361)
* :heavy_check_mark: **[Lemmy](https://github.com/dessalines/lemmy)**: Link aggregator, by [@LemmyDev](https://mastodon.social/@LemmyDev/102106696961226378) `AGPL-3.0, Rust`
* :heavy_check_mark: **[Smilodon](https://source.puri.sm/liberty/host/smilodon)**: the server by Purism used in LibreOne, not the abandoned Tuxcraft server or Pylodon client; a complementary fork of Mastodon, focusing on opt-in public spaces `AGPL-3.0, Ruby`
* :ghost: [**Anancus**](https://gitlab.com/tuxether/anancus): By [@tuxether](https://floss.social/@tuxether), Link aggregator, [discontinued](https://gitlab.com/tuxether/anancus/issues/2)?
* :ghost: [**Prismo**](https://gitlab.com/prismosuite/prismo) ([Fedi account](https://mastodon.social/@prismo)): Link aggregator. Latest update - May 2019. `AGPL-3.0, Ruby`
* :heavy_check_mark: **[CastoPod Host](https://code.podlibre.org/podlibre/castopod)** ([site](https://podlibre.org/), [Fedi account](https://podlibre.social/@castopod)): An open-source hosting platform made for podcasters who want engage and interact with their audience. `AGPL-3.0, PHP`
* :heavy_check_mark: **[Catcast D](https://github.com/mrcatman/catcast-d)** ([Fedi account](https://mastodon.social/@mrcatmann)): A federated video live streaming platform `-, Typescript`
* **[Librecast LIVE](https://github.com/librestack/librecast-live)** ([Fedi account](https://chaos.social/@onepict), [site](https://librecast.net/live.html)): Live Streaming Video Platform with Multicast `GPL-2.0-only OR GPL-3.0-only, Javascript`
* :heavy_check_mark: **[Owncast](https://github.com/owncast/owncast)** ([site](https://owncast.online), [Fedi account](@gabek@mastodon.social)): Owncast is a self-hosted live video and web chat server for use with existing popular broadcasting software. `MIT, Go`
* :black_nib: **[Soundstorm](https://github.com/weathermen/soundstorm)**: The Federated Social Audio Platform. (Currently inactive, see [issue](https://github.com/weathermen/soundstorm/issues/21#issuecomment-882626364)) `GPL-3.0, Python`
* :ghost: [**Acorde**](https://github.com/polymerwitch/Acorde) - federated social music platform. Almost a year has passed since the initial commit
* :ghost: [**Fontina**](https://github.com/beta-phenylethylamine/fontina) - proposed as a photo-sharing social media network. GH repo has gone read-only, and now says "dead project"
* :ghost: [**Marmota**](https://gitlab.com/Nefix/marmota/issues?label_name=ActivityPub): Streaming service like Spotify. No commits - since March 2019
* :ghost: [**Pubcast**](https://github.com/pubcast/pubcast) ([site](https://pubcast.pub)): Podcasting platform that allows people to listen to podcasts in a new way. Latest commit - March 2019. `MPL-2.0, Go`
* :ghost: [**PeerPx**](https://github.com/peerpx): Social network for photographers (alternative to 500px / Flickr); Latest commit - October 2018
* :ghost: :heavy_check_mark: [**reel2bits**](https://github.com/rhaamo/reel2bits) ([site](https://reel2bits.org)): Music and podcast hosting, `AGPL-3.0, Python`
* :heavy_check_mark: **[Gath](https://github.com/lowercasename/gathio)**: Public events with no registration required, an instance connected with the friend.camp Mastodon instance is up at: http://events.friend.camp `GPL-3.0, Javascript`
* :heavy_check_mark: **[Mobilizon](https://framagit.org/framasoft/mobilizon)** ([site](https://joinmobilizon.org/en), [Fedi account](https://framapiaf.org/@mobilizon)): Aims to be more than a Meetup clone `AGPL-3.0, Elixir`
Friendica (see above) has an [events engine that federates events over AP](https://socialhub.activitypub.rocks/t/activitypub-at-36c3-the-decentral-assembly-and-fediverse-party/402/5) and is looking to test interop with other AP events apps. [NextCloud federated events](https://github.com/nextcloud/calendar/pull/878) are in the works but this [may or may not be AP-compatible](https://github.com/nextcloud/server/issues/1440).
* :black_nib: **[Artist Hub](https://github.com/creative-passport/artist-hub)** ([site](https://www.creativepassport.net/)): Part of Creative Passport NGI0-funded project for providing a verified digital ID for Music Makers (very early stage of development) `AGPL-3.0, Typescript`
* **[MoodleNet](https://gitlab.com/moodlenet)**: [Social client for Moodle](https://moodle.com/moodlenet) LMS (Learning Management System) aimed at helping teachers collaboratively collate and curate sets of OER (Open Educational Resources)
* :heavy_check_mark: **[CPub](https://gitlab.com/openengiadina/cpub)**: a semantic web server, implements a Linked Data Platform (LDP), uses RDF Turtle as serialization format, part of the [openEngiadina](https://openengiadina.net) project `AGPL-3.0, Elixir`
* :black_nib: **[Inventaire](https://github.com/inventaire/inventaire)** ([site](https://inventaire.io/welcome), [Fedi account](https://mamot.fr/@inventaire)): A libre collaborative resource mapper powered by open-knowledge, starting with books. (Considers AP integration, see [Github issue](https://github.com/inventaire/inventaire/issues/187)) `AGPL-3.0, Javascript`
* :heavy_check_mark: **[OLKi](https://framagit.org/synalp/olki/olki/-/wikis/ActivityPub-dialect-documentation)** ([site](https://olki.loria.fr/platform), [Fedi account](https://mastodon.etalab.gouv.fr/@scifed)): A self-hosted linguistic corpora exchange platform that aims to be a simple gateway to the Fediverse for scientific interaction `AGPL-3.0, Python`
* :black_nib: **[Openki](https://gitlab.com/Openki/Openki)** ([site](https://openki.net/)): An interactive p2p web-platform to provide barrier-free access to education for everyone. (not federated yet, see [AP feature request](https://gitlab.com/Openki/Openki/-/issues/1263)) `AGPL-3.0, Javascript`
* :heavy_check_mark: **[SemApps](http://www.virtual-assembly.org/semapps-2/)** ([site](http://semapps.org/?PagePrincipale&lang=en)): A collaborative, generic knowledge management system. Aims to ease data storage and filtering. `Apache-2.0, Javascript`
* :heavy_check_mark: **[SkoHub](https://github.com/hbz/skohub-pubsub)** ([site](https://skohub.io)): Creates a publication / subscription infrastructure for Open Educational Resources. It allows to follow specific subjects and to be notified when new content about that subject is published. `Apache-2.0, Javscript`
* :black_nib: **[XWiki](https://github.com/xwiki)** ([site](http://www.xwiki.org/), [Fedi account](https://social.weho.st/@XWiki)): An advanced open source Enterprise Wiki (via the [ActivityPub Extension](https://extensions.xwiki.org/xwiki/bin/view/Extension/ActivityPub%20Application/)). `LGPL 2.1, Java`
* :heavy_check_mark: [**Learn Awesome**](https://github.com/learn-awesome/learn): Open-source equivalent review aggregation site. Think GoodReads, but generalized to all learning resources organized by topics, formats and difficulty. `AGPL-3.0, Ruby`
* :ghost: [**exlibris**](https://github.com/exlibris-fed/exlibris): A social network dedicated to tracking and discussing what you're reading, based on [go-fed](https://go-fed.org) (development stalled, see [this toot](https://mastodon.social/web/statuses/105567590537815892)). Latest commit - October 2020 `MIT, Go`
* :heavy_check_mark: [**Dharma**](https://github.com/cjslep/dharma): A federated community-building platform for Eve Online corporations. `AGPL-3.0, Go`
* :heavy_check_mark: [**castling.club**](https://github.com/stephank/castling.club) ([site](https://castling.club/), [Fedi account](https://mastodon.social/@kosinus)): Challenge someone to a game of chess using toots. An ActivityPub server with a single hardcoded King service actor that acts as a chess arbiter. `MIT, Typescript`
* :ghost: [**FediQuest**](https://shapegoal.org/matejlach/fediQ-server) ([site](https://shapegoal.org)): A federated alternative to traditionally centralized question & answer platforms, such as Quora/StackOverflow. `GPL-3.0, Go`
* :heavy_check_mark: **[Wolfgame](https://gitlab.com/stemid/wolfgame)** ([Fedi account](https://mastodon.se/@stemid)): Wolfgame is a lot like Mafia. Once started the game simulates day/night cycle and allows players to vote for who might be a werewolf during the day. `MIT, Python`
* :heavy_check_mark: **[Bonfire](https://github.com/bonfire-networks)**: ([site](https://bonfire.cafe), [Fedi account](https://indieweb.social/@bonfire)): Your plug & play federated social network. Based on CommonsPub, runs on RaspberryPi devices. Still in beta. `AGPL-3.0, Elixir`
* :heavy_check_mark: **[ForgeFriends](https://lab.fedeproxy.eu/forgefriends/forgefriends)** ([site](https://forgefriends.org), [Fedi account](https://mastodon.online/@forgefriends)): An online service to federate forges. `AGPL-3.0, Python`
* :tada: :heavy_check_mark: **[Group actor](https://git.ondrovo.com/MightyPork/group-actor)** ([Fedi account](https://piggo.space/users/piggo)): Groups work with any software that implements Mastodon client API; has moderation, admin announcements, [test server](https://piggo.space/hob) `MIT, Rust`
* :tada: :heavy_check_mark: **[Guppe](https://github.com/wmurphyrd/guppe)** ([site](https://a.gup.pe)): By [@datatitian](https://social.coop/@datatitian/102837577105371476), adds "groups" support as group-type actors `GPL-3.0, Javascript`
* :tada: :heavy_check_mark: [**Mastodon Bot Autoresponder**](https://github.com/drequivalent/mastodon-bot-autoresponder) ([Fedi account](https://mastodon.ml/@drq)): a bot that implements group functionality in Mastodon. `MIT, Python`
* :heavy_check_mark: [**tootgroup.py**](https://github.com/oe4dns/tootgroup.py): Emulate group accounts on Mastodon. `GPL-3.0, Python`
* :black_nib: [**Alovoa**](https://github.com/Alovoa/alovoa) ([site](https://alovoa.com/)): Free and open-source dating platform that respects your privacy (considering AP support, see [issue](https://github.com/Alovoa/alovoa/issues/13)) `AGPL-3.0, Java`
* :black_nib: [**Communecter**](https://github.com/pixelhumain/communecter) ([site](https://www.communecter.org/)): Manage cities as a connected citizen, produce openCityData, manage organizations, projects, events openly, an open societal approach (intends to add AP support, see [this issue]()) `Apache-2.0, PHP`
* :heavy_check_mark: [**Corteza**](https://github.com/cortezaproject/corteza-server) ([site](https://cortezaproject.org)): "Digital Work Platform for Humanity" an open-source, low-code federated platform for building cloud-based business apps with CRM capabilities `Apache-2.0, Go`
* :black_nib: [**FairSync**](https://git.fairkom.net/fairsync) ([site](https://fairmove.it/fairsync/)): Develops and collects best practices to synchronize maps and events and to federate messengers and identities. (Funded with NGI0, implementing ActivityStreams, but AP support not clear, currently unlicensed) `?, Java`
* :black_nib: [**Inbox**](https://github.com/WhyINeedToFillUsername/inbox) ([site](https://whyineedtofillusername.github.io/inbox/about)): An application built for a diploma thesis to showcase work with Linked Data Notifications, Activity Streams and ActivityPub, using Solid pod as data provider. (See also [Solid forum discussion](https://forum.solidproject.org/t/inbox-new-messaging-application/4093). No license, see [issue](https://github.com/WhyINeedToFillUsername/inbox/issues/2)) `-, Typescript`
* :black_nib: **[Life Server](https://github.com/interop-alliance/life-server)** ([site](https://permanent.cloud/apps/life-server)): A decentralized personal data framework inspired by MIT's Solid Project (AP support planned, see [Roadmap](https://github.com/interop-alliance/life-server/blob/main/README.md#roadmap)), `MIT, Javascript`
* :heavy_check_mark: [**Ocelot Social**](https://github.com/Ocelot-Social-Community/Ocelot-Social): Free and open-source social network for active citizenship. `MIT, Javascript`
* :ghost: [**Agora**](https://github.com/scenaristeur/agora): [Home page](https://scenaristeur.github.io/agora), POC to use ActivityPub on top of the Solid Platform. - developed by [@spoggy@mstdn.fr](https://mstdn.fr/@spoggy). Latest commit - June 2020
* :ghost: [**Numa**](https://github.com/numaverse/numaverse-gateway/issues/3) - built on Ethereum blockchain but intended to federate with AP. No commits since April 2018. No reply on issue about AP compatibility testing from May 8. Homepage now a spam site
Aside from project homepages and issue trackers, and comments made on the fediverse, the [SocialWG has a list](https://www.w3.org/wiki/Socialwg/ActivityPub_network) of projects they hoped would implement ActivityPub and links to issues where it's discussed. Also, there is an [implementation report on ActivityPub.rocks](https://activitypub.rocks/implementation-report/). @Mayel from Social.coop created a [web spreadsheet of AP apps](https://ethercalc.org/fediverse-stacks) and their characteristics. More projects using AP are [profiled on We Distribute](http://wedistribute.org/) by Sean Tilley and his team. There are boards for discussing a range of [AP implementations on the SocialHub forum](https://socialhub.activitypub.rocks/c/software/14). [Alternative.to](https://alternativeto.net/list/5696/activitypub) has a list of AP servers and client apps. The [ActivityPub tag on GH](https://github.com/topics/activitypub) is also a way to discover projects experimenting with AP.
