A curated list of resources for ActivityPub developers who create software for the Fediverse.
Bonfire: An extensible framework with a big focus on customisation and flexibility. Can be used to build new federated apps while focusing on a specific use case rather than reimplementing lots of boilerplate AGPL-3.0, Elixir
Fedify: A fediverse server framework in Deno AGPL-3.0, TypeScript
ActivityPhp (site, Fedi account): A PHP implementation of ActivityPub protocol based upon the ActivityStreams 2.0 data format. MIT, PHP
ActivityPods: Adding intelligence to Solid PODs with ActivityPub (based on SemApps. Apache-2.0, Javascript
ActivityPub: Generic library to federate an app with ActivityPub (uses a queue for incoming/outgoing activities and adapter modules for tight integration). AGPL-3.0, Elixir
activityPub-core: An attempt to build a spec-compliant ActivityPub core library. MIT, Typescript
ActivityPub Express: Modular ActivityPub implementation as Express.js middleware to easily add decentralization and federation to Node apps MIT, Javascript
ActivityPub-Federation: A high-level framework for ActivityPub federation in Rust, extracted from Lemmy. AGPL-3.0, Rust
:heavy_check_mark ActivityPub Models - "ActivityPub JS/TS models with docs TypeScript, -
ActivityPub HTTP Signatures (Fedi account): A library for creating, parsing, and verifying HTTP signature headers, as per the Signing HTTP Messages draft 80 specification. ISC, Javascript
ActivityPub-PHP (Fedi account): A PHP implementation of the ActivityPub protocol (used in Pterotype plugin). MIT, PHP
ActivityPub Starter Kit: A tiny, single user ActivityPub server, meant to be a starting point for your own ActivityPub projects. MIT, Typescript
activityPub4j: W3C ActivityPub and ActivityStreams implementation in Java using Spring Boot. Apache-2.0, Java
ActivityHub.Net: A C# .NET Implementation of ActivityPub Entity Types. -, C#
ActivityPub.Net: A parser for ActivityPub. MIT, C#
ActivityServe: A very light ActivityPub library in Go (used to power pherephone) MIT, Go
ActivityStream (Fedi account): Simple ActivityStream handling for Go. Apache-2.0, Go
ActivityStreams (Fedi account): A set of Traits and Types that make up the ActivityStreams and ActivityPub specifications. GPL-3.0, Rust
ActivityStreams: Full ActivityStreams 1.0 and 2.0 reference implementation in Java. Apache-2.0, Java
ActivityStreams: A .NET implementation of the Activity Streams vocabulary in the form of classes that can be serialized using System.Text.Json MIT, C#
ActivityStreams-2: ActivityStreams 2.0 library for Node.js and TypeScript. Apache-2.0, Typescript
astreams (Fedi account): A hand-crafted implementation of the Activity Streams 2.0 specification in Go, especially suitable for projects implementing ActivityPub. AGPL-3.0, Go
atoot: Library providing an easy way to create Mastodon API applications MIT, Python
Clovis: [ARCHIVED] Implementation of ActivityPub in Scala. (Hobby project included here for reference only.) AGPL-3.0, Scala
Bovine (PyPI, ReadTheDocs, Fedi account): Basic Python FediVerse utility library. MIT, Python
Chatter Net Client: A decentralized semantic web built atop self-sovereign identity. Client-side. MIT, Typescript
Chatter Net Server: A decentralized semantic web built atop self-sovereign identity. Server-side. MIT, Rust
corpus-activity-streams: Activity Streams 2.0 vocabulary data and alternative docs. Unlicense license, Typescript
DarkLink.Web.ActivityPub: A framework (kinda) to work with ActivityPub with .NET MIT, C#
Dialtone: An "un-imagined" ActivityPub service, to address emergent use cases. Multi-tenant, multi-personality, multi-ownership. Apache-2.0 / MIT, Rust
Digit: Simple API for building WebFinger resource responses. Apache-2.0, Go
Disboard: Collection of fediverse API wrapper libraries for .NET Standard 2.0. MIT, C#
Drastic.Mastodon: A fork of Masto.NET, a C#/.NET Library for accessing Mastodon. MIT, C#
Express ActivityPub: A very simple reference implementation of an ActivityPub server using Express.js. MIT, Javascript
Federails: An ActivityPub engine for Ruby on Rails. MIT, Ruby
Federation: Library to abstract social web federation protocols like ActivityPub, Diaspora and Matrix (see docs) BSD-3-clause, Python
FediKit: Building Blocks for Fediverse. MIT, TypeScript
fedi-inbox (Fedi account): Basic Fediverse Inbox. Writing software is hard and time consuming. What's the most basic practical system that lets us connect to the fediverse? -, Javascript
fuwuqi (Fedi account): A useless C2S ActivityPub server for "extremely hardcore" ActivityPub enthusiasts. GPL-3.0, Python
Golang ActivityPub (Fedi account): Libraries for using ActivityPub in the Go language. MIT, Go
go-fed activity (site, Fedi account): Full ActivityStreams & ActivityPub implementation in Golang. Extensions can be easily added by design-time code generation from JSON-LD schema's (also supports ForgeFed this way, by default). BSD-3-clause, Go
go-fed apcore (site, Fedi account): A powerful single server ActivityPub framework for performant Fediverse applications. AGPL-3.0, Go
go-mastodon: Mastodon client for Golang. MIT, Go
Hannibal: ActivityPub library for Golang. Apache-2.0, Go
hare-activity (Fedi account): Hare package provides a extensible implementation of the ActivityStreams 2.0 format and the ActivityPub protocols. MPL, Hare
http-signature: Implementation of the HTTP Signature scheme as used in ActivityPub. Apache-2.0, Typescript
Incognitum: A .NET Standard library for Mastodon. MIT, C#
Little Boxes: Tiny ActivityPub framework, both database and server agnostic ISC, Python
Little Library: A digital give-a-book, take-a-book library for ebooks AGPL-3.0, Javascript
Mastodon.py: Python wrapper for the Mastodon API. MIT, Python
Masto.Net: A C# Library for Mastodon. MIT, C#
Megalodon: Mastodon, Pleroma and Misskey API client library for node.js and browser. MIT, Typescript
Megalodon-rs: Mastodon and Pleroma API client library for Rust. Apache-2.0, Rust
Mod.ActivityPub: ActivityPub Server services for ASP.NET -, C#
Pub: A tiny ActivityPub to Mastodon bridge. BSD-3-Clause, Go
Pubstrate: ActivityStreams and ActivityPub library implementation for GNU Guile. Includes a full ActivityStreams library and most of an ActivityPub implementation. GPL-3.0, Guile
pynodeinfo: NodeInfo library implemented with poetry. AGPL-3.0, Python
Python ActivityPub: A general ActivityPub library MPL-2.0, Python
rdf-pub (site, Fedi account): An activity-pub server implementation, that is not limited to the activity-stream vocabulary, but supports RDF per se. EUPL, Java
Sigh (Fedi account): HTTP signatures for ActivityPub in Rust. MIT, Rust
The Old Dog and Duck: A Clojure library designed to implement the ActivityPub protocol. GPL-2.0, Clojure
ActivityPub for Drupal (site): Drupal module that implements the ActivityPub protocol for your site. GPL-2.0, PHP
FediEmbedi (Fedi account): A wordpress plugin widget to display your fediverse account timeline. GPL-3.0, PHP
Fediverse Tools for Joomla!: Integrate Mastodon with your Joomla! site. GPL-3.0, PHP
Hugo-ActivityStreams: A Hugo module for use in Hugo, to generate ActivityStreams representations of posts. (mirror) MIT, Go
Jekyll::MastodonWebfinger (Fedi account): A Jekyll plugin that adds a WebFinger file to your site, allowing you to use your own domain to help others discover your Mastodon profile. MIT, Ruby
Mastodon Wordpress Autopost (site): A Wordpress Plugin that automatically posts your new articles to Mastodon. GPL-2.0, PHP
Pterotype: WordPress plugin. Pterotype connects your blog to the Fediverse by giving it an ActivityPub feed MIT, PHP
rustypub (site, Fedi account): Early beginnings of ActivityPub library in Rust (started August 2022, see announcement). Apache-2.0, Rust
Vue Component Library for ActivityPub Timelines: Integrate your Fediverse timeline into your Vue 3 with Bootstrap 5 application. MIT, Vue
WordPress-ActivityPub: ActivityPub for Wordpress MIT, PHP
WordPress-OStatus: An OStatus plugin for WordPress MIT, PHP
XWiki Extension for ActivityPub (site, Fedi account): An implementation of the ActivityPub protocol for XWiki (see forum discussion). LGPL-2.1, Java
GNUBOARD5-ActivityPub: ActivityPub plugin for GNUBOARD5 a general-purpose CMS. MIT, PHP
ActivityRelay: A generic LitePub relay (works with all LitePub consumers and Mastodon). AGPL-3.0, Python
activity-relay: Yet another powerful customizable ActivityPub relay server written in Go AGPL-3.0, Go
Hash2Pub (Fedi account): A fully-decentralised DHT-based relay for global hashtag federation. See White paper, status update (Nov 2020) AGPL-3.0, Haskell
Pub-Relay (Fedi account): A service-type ActivityPub actor that will re-broadcast anything sent to it to anyone who subscribes to it. AGPL-3.0, Crystal
Seattle relay -, Python
Social relay: Public post relay for the diaspora* federated social network protocol. AGPL-3.0, Python
toot-relay: Relay that forwards web push notifications to APNs, built for Toot!.app but usable for anyone. CC0, Go
AodeRelay: A simple and efficient ActivityPub relay. AGPL-3.0, Rust
For an overview of known relays, see Relay List, a regularly updated, sorted list of ActivityPub relays for Mastodon or Pleroma.
bird.makeup (Fedi account) A Twitter bridge to the Fediverse. Forked from BirdSiteLIVE. AGPL-3.0, C#
BirdSiteLIVE (Fedi account): An ethical bridge from Twitter AGPL-3.0, C#
bleroma: Telegram bot for Pleroma and Mastodon. MIT, Elixir
Bridgy Fed (site, Fedi account): Bridges the IndieWeb to federated social networks: ActivityPub, OStatus, etc. Public Domain, Python
Fediverse-Action: Github Action that posts to Fediverse when code is changed. ISC License, Javascript
Toot-Together (Fedi account): Github Action that posts to Mastodon from text files, enabling everyone to submit toot drafts to a project. MIT, Javascript
feedToMasto: Node app that checks a list of feeds (Atom, RSS, RDF) periodically, post new items to Mastodon. ISC, Javascript
feed2toot: Parses RSS feeds, identifies new posts and posts them on the Mastodon social network (using the Mastodon API). MIT, Python
feediverse: Send RSS/Atom feeds to Mastodon. MIT, Python
gemifedi: A Gemini frontend to the fediverse (specifically, Mastodon and Pleroma instances). AGPL-3.0, Rust
ghostcms-activitypub: An ExpressJS server that integrates with GhostCMS webhooks to publish ActivityPub content on the Fediverse. MIT, JavaScript
Hatsu: Self-hosted & Fully-automated ActivityPub Bridge for Static Sites. AGPL-3.0, Rust
Instagram2Fedi: Script for crossposting from Instagram to Mastodon or Pixelfed. GPL-3.0, Python
Kazarma: A Matrix bridge to ActivityPub. AGPL-3.0, Elixir
Libervia (site, Fedi account): An XMPP <=> ActivityPub gateway project doubled with XMPP Pubsub end-to-end encryption AGPL-3.0, Python
ligh7hau5: A Matrix to Fediverse / ActivityPub client / bridge. Also, some media proxying. GPL-3.0, Javascript
mastodon-bot: a bot for mirroring Twitter / Tumblr accounts and RSS feeds on Mastodon MIT, Clojure
mastodon-twitter-poster (site, Fedi account): Crossposter to post statuses between Mastodon and Twitter. AGPL-3.0, Ruby
mastotuit (Fedi account): Publishes to Twitter all your Mastodon public text only posts but also your posts with images, with videos and even your polls. GPL-3.0, Python
Moa (site): A Mastodon, Twitter, and Instagram Cross-poster. MIT, Python
Mobilizon Crossposter: A modular crossposter to bridge events from sources you have to setup yourself to Mobilizon. GPL-3.0, Python
MXToot (Fedi account): A Matrix <--> Mastodon bot written in Java. Apache-2.0, Java
Nautilus: A standalone service to deliver posts from your own website to ActivityPub followers. Apache-2.0, PHP
PeerTube (on Matrix) Search: Search PeerTube via Matrix, using Sepia Search API to search on all participating public PeerTube instances. You can also select any single instance. It's implemented as a module for Hemppa the bot. GPL-3.0, Python
pleroma-bot: Mirrors Twitter accounts to Fediverse, or migrates Twitter account to Fediverse using a Twitter archive. Supports Mastodon, Pleroma and Misskey. MIT, Python
Pubgate Telegram: Extension for PubGate, federates Telegram channels and back. BSD-3-Clause, Python
rss-bot (Fedi account): Post updates from an RSS feed to Mastodon. GPL-3.0, Python
RSS-to-ActivityPub Converter: Convert any RSS feed to an ActivityPub actor that can be followed by users on ActivityPub-compliant social networks like Mastodon. MIT, Javascript
RSS-Bridge ActivityPub Bridge (site, Fedi account): Generates RSS and Atom feeds for websites that don't have one. Supports Mastodon, Pleroma and Misskey, among others. Unlicense, PHP
✔️Simplebot-Mastodon: A Mastodon - DeltaChat bridge plugin for SimpleBot, list of bot instances MPL-2.0, Python
Twitter Hamachpil (Fedi account): Bot to grab tweets from Twitter and post them to respective accounts on a Mastodon instance. Apache-2.0, Python
YouTube2PeerTube: A bot that mirrors YouTube channels to PeerTube channels as videos are released in a YouTube channel. AGPL-3.0, Python
Raycast Extension for Akkoma (site): By @Seviche CC, Publish status from Raycast to Akkoma or Pleroma, and view your bookmarked status MIT, TypeScript
ActivityPubBotDotNet (Fedi account): An implementation of a ActivityPub bot that can communicate with Mastodon servers. MIT, C#
ActivityPubSchema: JSON Schema definition of the ActivityStreams and ActivityPub specifications. MIT, Javascript
ActivityPub Pelican Plugin: Experimental ActivityPub plugin for Pelican static site generator. ISC, Python
activity-streams-validator (Fedi account): Activity Streams validation for Typescript. MIT, Typescript
AP follow - A remote follow tool to share links and buttons that allow people to follow you from their own ActivityPub instance BSD-2-clause, PHP
bridge: A simple web app that helps you find your Twitter friends on the federated Mastodon network. It is also an example of how the Mastodon API can be used and the federated OAuth authorization flow. AGPL-3.0, Ruby
dda-masto-embed (Fedi account): Embeds mastodon timline into a html page. Uses JS, no intermediate server required. Apache-2.0, ClojureScript
emfed (Fedi account): Embed your Mastodon feed into your web page. Unlicense, Typescript
f2ap: A web application that uses the RSS/Atom feed of your website to expose it on the Fediverse through ActivityPub. AGPL-3.0, Python
FediAct: Chrome/Firefox extension that simplifies interactions on other Mastodon instances than your own. MIT, Javascript
fediblock-importer: Import domain blocks to your Mastodon v4+ instance. GPL-3.0, Python
FediCraft: Federated network support for Minecraft. (fabric and quilt). MIT / Apache-2.0, Java
FediFetcher for Mastodon (site): Automatically fetch missing replies and posts from other fediverse instances. MIT, Python
Fedifinder - Find fediverse addresses in the profiles of your Twitter followings MIT, Javascript
fediverse.space (Fedi account, site): A tool to visualize instances in the fediverse. AGPL-3.0, Elixir
Fediverse Stats (Fedi account): Collects maximum number of alive fediverse's servers and then query their API to obtain their registered users. GPL-3.0, Python
Followgraph (site, Fedi account): A tol to expand your connection graph and find new people to follow. (Unlicensed, see open issue) -, Typescript
forget (site, Fedi account): Continuous post deletion for Mastodon and Twitter (if you happen to use that). ISC License, Python
Granary (site): The social web translator. Fetches and converts data between social networks, HTML and JSON with microformats2, ActivityStreams, Atom, JSON Feed, and more. Public domain, Python
hunter2 (site, Fedi account): A job hunt bot that indexes jobs and candidates from the Fediverse. MIT, Rust
MaPleFeed (site, Fedi account): Embed Mastodon or Pleroma profile feeds on any web page. MIT, Javascript
MastoBot (Fedi account): NodeJS Mastodon client library with an eye to making bot development fun & easy. ISC License, Javascript
Mastodon Archive:Archive your statuses, favorites and media using the Mastodon API. GPL-3.0, Python
mastodon-backup (Fedi account): Archive your statuses, favorites and media using the Mastodon API. GPL-3.0, Python
Mastodon Backup Resore: Bash scripts for backup / restore of Mastodon. MIT, Shell
Mastodon Bird UI: Alternative stylesheet to make Mastodon UI represent the Birdsite. MIT, CSS
mastodon_bulk_find_follow (site): Bulk find and follow to make it easy to migrate from Twitter to Mastodon. BSD-3-Clause, Javascript
mastodon_digest (Fedi account): A script that aggregates recent popular posts from your Mastodon timeline. BSD-3-Clause, Python
MastodonKit (site): A Swift Framework that wraps Mastodon's API. MIT, Swift
mastodon_recommender: Script that recommends people for you to follow on Mastodon based on your own account. -, Python
Masto Follow (site, Fedi account): Simple widget to support “Follow Me on Mastodon” buttons ISC License, Javascript
MastoMods (Fedi account): CSS tweaks and custom themes for Mastodon. Unlicense, CSS
Masto Thread Renderer (site, Fedi account): Display a Mastodon thread (only author toots, no replies) as a web page or Markdown for reading. Apache-2.0, Rust
Mastotool: A collection of tools to work with your Mastodon account; displays account statistics and lets you search your toots. MIT, Go
Minoru's Fediverse Crawler (site, Fedi account): Crawls the Fediverse and produces a list of instances that are alive. AGPL-3.0, Rust
Moderator Alerts (Fedi account): Mastodon moderation alerts using Pushover.net. -, Python
M-OAuth(site) (Fedi account): Access token generator for Akkoma, Pleroma, Mastodon APIs. GPL-3.0, TypeScript
OCR Bot (Fedi account): An OCR (Optical Character Recognition) bot for Mastodon (and compatible) instances AGPL-3.0, Python
Pherephone: An ActivityPub server that reblogs all the statuses of certain actors. You set it up to follow a few accounts and it announces everything they post. AGPL-3.0, Go
PocketToots:A Firefox extension that saves your Mastodon bookmarks to Pocket. GPL-3.0, Javascript
RapidBlock (site): A tool for syndicating domain blocks across the Fediverse. BSD2-Clause, Go
rtoot (Fedi account, site): R package to interact with the mastodon API. MIT, R
Shareon (site, Fedi account): Lightweight, stylish, and ethical share buttons. MIT, Javascript
Steampipe Mastodon Plugin: Use SQL to instantly query Mastodon timelines and more. Open source CLI to Steampipe SaaS. No DB required. Apache-2.0, Go
Steampipe Mastodon Insights Mod: View Mastodon timelines, search hashtags, find interesting people, and check server stats. Apache-2.0, SourcePawn
StreetPass (site): A browser extension that helps you find people on Mastodon. MIT, Typescript
tags-pub: Provides hashtag objects on the ActivityPub network. Apache-2.0, Javascript
toot (site, Fedi account): Cross-instance share page for Mastodon AGPL-3.0, Javascript
TootSDK: Cross-platform Swift library for the Mastodon API. BSD-3-Clause, Swift
toot-volute: An interpreter for Mastodon posts. GPL-3.0, Javascript
Twitodon (site) - Twitter to Mastodon account mapping service to aid migration away from Twitter without losing all your followed friends - , Javascript
yt2pt: A simple set of scripts to quickly import your youtube channel to Peertube. MIT, Javascript
WebAP Browser Extension: This is a browser extension that implements the WebAP API (still an idea), exposing it to web applications. MIT, Typescript
activitypub-mock: A mock ActivityPub server to use in testing code Apache-2.0, Javascript
APDebug (Fedi account): A set of tools to debug ActivityPub requests. You can inspect requests, see the flow in real time, run arbitrary requests with HTTP signature handled for you. AGPL-3.0, PHP
dfk-ap (site): A small ActivityPub debugging server on Glitch MIT, Javascript
FediDB (site, Fedi account): A suite of tools for AP devs to help make it easier to test and validate your implementation with existing implementations like Mastodon, PeerTube, Pixelfed and Pleroma AGPL-3.0, PHP
Test Suite: An unofficial partially-automated ActivityPub test suite AGPL-3.0, Go
This category is dedicated to an important new direction on the Fediverse, where Software Development itself becomes federated. Currently the focus is on projects and protocols that allow for the federation of code forges (such as Gitea and Gitlab).
gofff (Fedi account): Reference implementation of Friendly Forge Format in Golang. AGPL-3.0, Go
pyfff (Fedi account): Reference implementation of Friendly Forge Format in Python. AGPL-3.0, Python
ForgeFlux StarChart: Software forge spider. Crawler that maps and advertises self-hosted code forge instances. AGPL-3.0, Rust
giteacat: Python script that allows sign up to a Gitea instance to all local users of a Mastodon server. -, Python
GPL-2.0, Python
ForgeFed (site, Fedi account): A set of extensions to ActivityPub for federation between code forges (Reference implementation is Vervis). CC0-1.0
Friendly Forge Format (Fedi account): An Open File Format for storing the information from a forge. -
This category is for any code project related to the Fediverse. They need not be directly development related.
AGPL-3.0, Typescript
Share Buttons: Share buttons that support dynamic input of Fediverse URLs and require no Javascript. AGPL-3,0, PHP
Fedishare: Firefox toolbar extension to share the current browser tab on the Fediverse GPL-3.0, Typescript
ISC, Javascript
ActivityPub Ontology (site): Turtle definitions of ActivityStreams 2.0 and Mastodon Toot vocabularies. MIT, Turtle
LitePub (Fedi account): A set of extensions to AP, being developed by devs from Pleroma and Mastodon (status: for the most part litepub group folded back into SocialCG, see: issue)
NodeInfo: Defines a standardized way to expose metadata about an installation of a distributed social network. CC0
Podcasting: Workspace for defining ActivityPub and ActivityStream extensions for Podcasting with the intention to define a W3C Recommendation for them.
SciFed (Fedi accounts: @rigelk, @cerisara): A specification standard (Draft) for federation of scientific activities and content using ActivityPub, developed as part of the OLKi project.
NodeInfo2 (Fedi account): An effort to create a standardized way of exposing metadata about a server. CC0-1.0
Guide for new ActivityPub Implementers: A crowd-sourced wiki maintained by SocialHub community with a ton of information and links.
ActivityPub for Podcast Client Apps: Overview on how to implement cross-app comments for podcasts.
Activity Anchors (github): An anchoring system for a fediverse of interconnected nodes and witnesses.
The did:orb Method (github): A DID Method for a fediverse of interconnected nodes and witnesses.
Content-addressible RDF: A scheme based on RDF allowing for data to be referred to by an identifier determined by the data itself (written by @pukkamustard of openEngiadina, specification now part of DREAM)
Encoding for Robust Immutable Storage (ERIS): ERIS is an encoding of arbitrary content into a set of uniformly sized, encrypted and content-addressed blocks as well as a short identifier (a URN) (written by @pukkamustard of openEngiadina, specification now part of DREAM).
If you have questions or feedback regarding this list, then please create an Issue in our tracker, and optionally @mention
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With delight we present you some of our delightful contributors (please add yourself if you are missing).