DotNet ActivityPub Projects

Searchable index of open-source ActivityPub projects based on C# or DotNet.

This is very much a work in progress! Right now it is neither searchable, nor much of an index. If you know of more projects, then please submit an issue or PR! Anything using C# or .NET for ActivityPub integration is fair game.

The information here is a product of my own research. Mistakes are likely, and feedback is welcomed! I make no promises or guarantees regarding the accuracy of this data, especially as some of these projects are under active development. To the best of my knowledge, this table is accurate as of January 8, 2024.

Information

Types and Categories

The projects in this index are loosely categorized based on type and intended use case. The goal of this is not really to describe the projects; rather, it is to group them based on common traits. At a later date, this will be used to filter the set of feature icons shown for each type of project. It might even be used to split up the table, if the project list ever grows that large.

The current list of categories is derived by comparing the listed projects. I've not attempted to "guess" other likely categories, although there are so obvious gaps where there likely will be at least one project in the future. If that happens, then more categories will be defined.

The current categories are:

Library: the project is a library intended for use in other projects.
Server: the project is a server application, possibly acting as a federated note.
Automation: the project is an automated application, like a bot or batch processor.

The use cases are:

General: the project does not have a defined use case and/or is meant for multiple purposes.
Conversion: the project is meant to support conversion to/from JSON, JSON-LD, or some other format.
Bridge: the project acts as a bridge between ActivityPub and some other network.
Bot: the project implements a bot or other automated actor.
Microblogging: the project is meant for use in Microblogging social networks, like Mastodon or Firefish.
Tumbleblogging: the project is meant for use in Tumbleblogging platforms.

Status Codes

Status codes are based on the project's listed status, or - failing that - my own personal opinion. Relevant factors include support for "important" ActivityPub features, level of support for the intended use case, and code maturity. That latter point is even *more* subjective, so please take this field with a grain of salt.

Status codes:

Development: the project is still under development and not yet usable.
Alpha: core functionality is in place, but key features are still under development.
Beta: the project is mostly usable, but may still have bugs or missing features.
Stable: everything is in place for production usage.
Abandonded: development has stopped or the project has been ended.

Projects

Project	Type	Description	Status	Features (click to expand, hover for details)
ActivityPubSharp	Library: General	Modular implementation of ActivityPub in C#	Development	✔️ Type Model ✔️️ Core ✔️️ Extended ✔️️ Unions ➖ Conversion ✔️️ JSON ➖ JSON-LD ❌ Database ➖ Extensions ➖ Known ✔️️ Unknown ✔️️ Types ✔️️ Properties ➖ Usability ➖ Client ❌ Server ❌ Federation ❌ Signatures ❌ Related ❌ WebFinger ❌ NodeInfo
DarkLink.Web.ActivityPub	Library: General	A framework (kinda) to work with ActivityPub with .NET	Development	➖ Type Model ✔️️ Core ✔️️ Extended ➖ Unions ✔️ Conversion ✔️️ JSON ✔️️ JSON-LD ✖️ Database ➖ Extensions ❌ Known ➖ Unknown ✔️️ Types ➖ Properties ➖ Usability ❌ Client ➖ Server ❌ Federation ❌ Signatures ➖ Related ✔️️ WebFinger ❌ NodeInfo
Meep-Tech / ActivityPub.Net	Library: Conversion	Activity Hub .net implementation	Abandonded	➖ Type Model ✔️️ Core ➖ Extended ➖ Unions ➖ Conversion ✔️️ JSON ❌ JSON-LD ❌ Database ➖ Extensions ❌ Known ❌ Unknown ✔️️ Types ❌ Properties ❌ Usability ✖️ Client ✖️ Server ✖️ Federation ✖️ Signatures ❌ Related ✖️ WebFinger ✖️ NodeInfo
judgy / ActivityPub.Net	Library: Conversion	A parser for ActivityPub	Abandonded	➖ Type Model ✔️️ Core ➖ Extended ➖ Unions ❌ Conversion ❌ JSON ❌ JSON-LD ❌ Database ❌ Extensions ❌ Known ❌ Unknown ❌ Types ❌ Properties ❌ Usability ✖️ Client ✖️ Server ✖️ Federation ✖️ Signatures ❌ Related ✖️ WebFinger ✖️ NodeInfo
ActivityStreams	Library: Conversion	A .NET implementation of the Activity Streams vocabulary	Beta	✔️ Type Model ✔️️ Core ✔️️ Extended ✔️️ Unions ➖ Conversion ✔️️ JSON ➖ JSON-LD ❌ Database ➖ Extensions ❌ Known ➖ Unknown ✔️️ Types ❌ Properties ❌ Usability ✖️ Client ✖️ Server ✖️ Federation ✖️ Signatures ❌ Related ✖️ WebFinger ✖️ NodeInfo
Letterbook	Server: Microblogging	Mastodon-compatible microblogging server, optimized to reduce administrative costs and burdens	Development	✔️ Type Model ✔️️ Core ✔️️ Extended ✔️️ Unions ➖ Conversion ✔️️ JSON ➖ JSON-LD ➖ Database ➖ Extensions ➖ Known ✔️️ Unknown ✔️️ Types ✔️️ Properties ➖ Usability ✖️ Client ➖ Server ➖ Federation ✔️️ Signatures ➖ Related ➖ WebFinger ❌ NodeInfo
Smilodon	Server: Microblogging	Mastodon-compatible Fediverse Application written in C# with .NET 7	Development	❌ Type Model ❌ Core ❌ Extended ❌ Unions ❌ Conversion ❌ JSON ❌ JSON-LD ❌ Database ❌ Extensions ❌ Known ❌ Unknown ❌ Types ❌ Properties ➖ Usability ✖️ Client ➖ Server ❌ Federation ❌ Signatures ❌ Related ❌ WebFinger ❌ NodeInfo
iceshrimp-rewrite	Server: Microblogging	N/A	Development	➖ Type Model ➖ Core ➖ Extended ❌ Unions ➖ Conversion ➖ JSON ➖ JSON-LD ➖ Database ➖ Extensions ✔️️ Known ❌ Unknown ❌ Types ❌ Properties ➖ Usability ✖️ Client ➖ Server ❌ Federation ✔️️ Signatures ❌ Related ❌ WebFinger ❌ NodeInfo
Tumblepub	Server: Tumbleblogging	A federated tumbleblog hosting platform	Alpha	➖ Type Model ✔️️ Core ➖ Extended ❌ Unions ➖ Conversion ✔️️ JSON ❌ JSON-LD ➖ Database ❌ Extensions ❌ Known ❌ Unknown ❌ Types ❌ Properties ➖ Usability ✖️ Client ➖ Server ❌ Federation ❌ Signatures ➖ Related ➖ WebFinger ❌ NodeInfo
Fedodo	Server: General	Open Source social network implementing the ActivityPub standard	Abandonded	➖ Type Model ✔️️ Core ✔️️ Extended ❌ Unions ➖ Conversion ✔️️ JSON ❌ JSON-LD ✔️️ Database ❌ Extensions ❌ Known ❌ Unknown ❌ Types ❌ Properties ➖ Usability ✖️ Client ➖ Server ➖ Federation ➖ Signatures ✔️ Related ✔️️ WebFinger ✔️️ NodeInfo
Mod.ActivityPub	Server: General	ActivityPub Server services for ASP.NET	Development	❌ Type Model ❌ Core ❌ Extended ❌ Unions ❌ Conversion ❌ JSON ❌ JSON-LD ❌ Database ❌ Extensions ❌ Known ❌ Unknown ❌ Types ❌ Properties ➖ Usability ✖️ Client ➖ Server ❌ Federation ❌ Signatures ➖ Related ❌ WebFinger ✔️️ NodeInfo
BirdsiteLive	Automation: Bridge	An ethical bridge from Twitter	Beta	➖ Type Model ✔️️ Core ➖ Extended ❌ Unions ➖ Conversion ✔️️ JSON ❌ JSON-LD ❌ Database ❌ Extensions ❌ Known ❌ Unknown ❌ Types ❌ Properties ✔️ Usability ✖️ Client ✔️️ Server ✔️️ Federation ✔️️ Signatures ✔️ Related ✔️️ WebFinger ✔️️ NodeInfo
bird.makeup	Automation: Bridge	Twitter bridge to the fediverse	Stable	➖ Type Model ✔️️ Core ➖ Extended ❌ Unions ➖ Conversion ✔️️ JSON ❌ JSON-LD ❌ Database ➖ Extensions ➖ Known ❌ Unknown ❌ Types ❌ Properties ✔️ Usability ✖️ Client ✔️️ Server ✔️️ Federation ✔️️ Signatures ✔️ Related ✔️️ WebFinger ✔️️ NodeInfo
ActivityPubBotDotNet	Automation: Bot	Implementation of an ActivityPub bot that can communicate with Mastodon servers	Beta	✔️ Type Model ✔️️ Core ✔️️ Extended ✔️️ Unions ➖ Conversion ✔️️ JSON ➖ JSON-LD ❌ Database ➖ Extensions ❌ Known ➖ Unknown ✔️️ Types ❌ Properties ➖ Usability ❌ Client ✔️️ Server ✔️️ Federation ➖ Signatures ➖ Related ✔️️ WebFinger ❌ NodeInfo
Toki	Server: Microblogging	A C# Fediverse server	Alpha	➖ Type Model ✔️️ Core ✔️️ Extended ❌ Unions ➖ Conversion ✔️️ JSON ❌ JSON-LD ✔️️ Database ➖ Extensions ➖ Known ❌ Unknown ➖ Types ❌ Properties ➖ Usability ✖️ Client ✔️️ Server ➖ Federation ➖ Signatures ✔️ Related ✔️️ WebFinger ✔️️ NodeInfo