Other Servers

Beyond the major platforms, many other ActivityPub servers exist for various use cases.

Microblogging

Akkoma

Fork of Pleroma with additional features.

Property	Value
Language	Elixir
License	AGPL-3.0
Repository	akkoma.dev/AkkomaGang/akkoma

Features:

• Emoji reactions
• Quote posts
• Markdown/BBCode
• MRF (Message Rewrite Facility)

Rebased (Soapbox)

Pleroma fork with Soapbox frontend and enhanced features.

Property	Value
Language	Elixir
License	AGPL-3.0
Website	soapbox.pub
Repository	gitlab.com/soapbox-pub/rebased

Features:

• Modern React frontend (Soapbox FE)
• Quote posts and reactions
• Improved moderation tools
• Nostr integration via Mostr

Ditto

Nostr-native server with ActivityPub support.

Property	Value
Language	TypeScript (Deno)
License	AGPL-3.0
Repository	gitlab.com/soapbox-pub/ditto

Features:

• Nostr as primary protocol
• ActivityPub federation bridge
• Soapbox FE compatible
• Lightweight, single binary

Honk

Minimalist ActivityPub server.

Property	Value
Language	Go
License	ISC
Repository	humungus.tedunangst.com/r/honk

Features:

• Single user focus
• Minimal dependencies
• SQLite database
• Simple deployment

Takahē

Multi-domain ActivityPub server.

Property	Value
Language	Python (Django)
License	BSD-3
Repository	github.com/jointakahe/takahe

Features:

• Multiple domains on one instance
• Identity-based federation
• PostgreSQL database

Sharkey

The main actively maintained Misskey fork.

Property	Value
Language	TypeScript
License	AGPL-3.0
Website	joinsharkey.org
Repository	activitypub.software/TransFem-org/Sharkey

Features:

• All Misskey features (reactions, quotes, MFM)
• Mastodon-compatible client API
• Regular releases

Iceshrimp.NET

Ground-up .NET rewrite continuing the Iceshrimp project (Misskey lineage).

Property	Value
Language	C# (.NET)
License	EUPL-1.2
Repository	iceshrimp.dev/iceshrimp/Iceshrimp.NET

Features:

• Lightweight compared to Node-based Misskey lineage
• Mastodon-compatible client API
• In beta as of 2026

Blogging

WriteFreely

Federated blogging platform.

Property	Value
Language	Go
License	AGPL-3.0
Repository	github.com/writefreely/writefreely

Federation:

• Articles appear as Notes
• Followers can follow blogs
• Comments via replies

Plume

Federated blogging engine.

Property	Value
Language	Rust
License	AGPL-3.0
Repository	github.com/Plume-org/Plume

Ghost

Major open-source publishing platform with built-in ActivityPub since Ghost 6.0 (August 2025) — free on all sites, both Ghost(Pro) and self-hosted.

Property	Value
Language	JavaScript (AP service: TypeScript, built with Fedify)
License	MIT
Website	ghost.org
AP service	github.com/TryGhost/ActivityPub

Federation:

• Long-form posts and short-form notes federate; followers can like and reply
• Reader splits long-form (Inbox) from short-form (Feed)
• ActivityPub runs as a separate multi-tenant service; self-hosted installs default to Ghost's hosted gateway, or fully self-host via the Docker activitypub profile

WordPress (ActivityPub plugin)

Automattic-maintained plugin that federates WordPress sites.

Property	Value
Language	PHP
License	MIT
Repository	github.com/Automattic/wordpress-activitypub

Federation:

• Author and blog-level actors
• Posts federate to followers; comments arrive as replies
• One of the largest fediverse deployments by install base

Books & Media

BookWyrm

Federated book tracking (Goodreads alternative).

Property	Value
Language	Python (Django)
License	Anti-Capitalist License
Repository	github.com/bookwyrm-social/bookwyrm

Federation:

• Book reviews federate as Articles
• Reading status updates
• Shelves as Collections

Funkwhale

Federated music streaming.

Property	Value
Language	Python (Django)
License	AGPL-3.0
Repository	dev.funkwhale.audio

Federation:

• Audio objects
• Libraries and channels
• Follows and shares

Owncast

Federated live streaming.

Property	Value
Language	Go
License	MIT
Repository	github.com/owncast/owncast

Federation:

• Stream notifications
• Follows
• Chat integration

Loops

Federated short-form video (TikTok-style), by the Pixelfed team. Open beta.

Property	Value
Language	PHP (Laravel) + Vue
License	AGPL-3.0
Website	joinloops.org
Repository	github.com/joinloops/loops-server

Federation (beta since October 2025):

• Videos federate as Note objects for maximum compatibility
• Follows, replies, likes, and shares with Mastodon, Pixelfed, PeerTube
• WebFinger, HTTP Signatures, shared inboxes

Link Aggregation

Mbin

Community-maintained fork of /kbin (now abandoned) — combines link aggregation and microblogging.

Property	Value
Language	PHP
License	AGPL-3.0
Repository	github.com/MbinOrg/mbin

Features:

• Magazines (communities) federate with Lemmy and PieFed
• Microblog posts federate with Mastodon
• Active development

Events

Mobilizon

Federated event organizing.

Property	Value
Language	Elixir
License	AGPL-3.0
Repository	framagit.org/framasoft/mobilizon

Federation:

• Event objects
• Group organizing
• RSVP activities

Social Networks

Friendica

Full-featured social network.

Property	Value
Language	PHP
License	AGPL-3.0
Repository	github.com/friendica/friendica

Features:

• Multiple protocol support
• Facebook-like interface
• Events, polls, calendar

Hubzilla

Decentralized publishing platform.

Property	Value
Language	PHP
License	MIT
Repository	framagit.org/hubzilla/core

Features:

• Nomadic identity
• Zot protocol + ActivityPub
• Channels and permissions

Commercial Platforms

Threads (Meta)

Meta's Threads federates over ActivityPub — the largest commercial platform on the protocol. Worth understanding precisely, because federation is partial.

Property	Value
Operator	Meta
Federation	Opt-in per user (18+, public profiles)
Availability	Global except the European Region (as last stated, June 2025)

What works (as of mid-2026):

• Opted-in users' posts federate out; fediverse users can follow, like, reply to, and boost them
• Threads users can follow fediverse accounts, with a dedicated fediverse feed and user search (since June 2025)
• Threads users see fediverse replies on their own posts and can like them

Limitations:

• Threads users cannot reply to fediverse posts from Threads (stated as a future goal)
• Posts with polls, restricted replies, or quotes of non-federated posts don't federate out
• Meta reports Threads has interacted with over 75% of fediverse servers (June 2025)

For Implementers

Treat Threads as a large but feature-limited peer: deliveries work like any Mastodon-compatible server, but don't assume bidirectional conversation threads.

Relays

Activity Relay

Boost federation between instances.

Property	Value
Language	Python
Repository	git.pleroma.social/pleroma/relay

Purpose:

• Connect smaller instances
• Share public content
• Increase discoverability

Aode Relay

Modern relay implementation.

Property	Value
Language	Rust
Repository	git.asonix.dog/asonix/relay

Comparison

Server	Focus	Language	Resources
Akkoma	Microblog	Elixir	Medium
Rebased	Microblog	Elixir	Medium
Ditto	Nostr+AP	TypeScript	Low
Honk	Minimal	Go	Very Low
WriteFreely	Blogging	Go	Low
BookWyrm	Books	Python	Medium
Funkwhale	Music	Python	Medium
Mobilizon	Events	Elixir	Medium

See Also

• Server Software Overview
• Libraries Overview