A simple, minimalistic ActivityPub instance written in portable C
activity-based computing | Are.na
ActivityPub Over ATProto
Thought experiment: how hard would it be to implement ActivityPub over ATProto? The answer might surprise you!
ActivityPub
ActivityPub is a protocol and open standard for decentralized social networking. It provides a client-to-server (C2S) API for creating and modifying content, as well as a federated server-to-server (S2S) protocol for delivering notifications and content to other servers. ActivityPub is the defining standard of the Fediverse, a decentralised social network of various social interaction models, and content types, which consists of independently managed instances of software such as Mastodon, Pixelfed and PeerTube, among others.
Developer Documentation for ActivityPub & Fediverse | SocialDocs
The comprehensive developer resource for building with ActivityPub, Mastodon, and the Fediverse. Guides, specs, API reference, and tools.
ActivityPods - Personal data spaces powered with ActivityPub
Brings together ActivityPub and Solid Pods and empowers developers to create truly decentralized applications.
ActivityPub Won by Being Boring
At FediForum 2026, ActivityPub co-author Evan Prodromou explained why the protocol succeeded by staying deliberately ordinary and why the W3C's Q3 2026 revision needs to keep it that way.
There are no instances in ATProto | Hacker News
I feel like you've (perhaps purposefully?) misinterpreted "instances" just to plug ATProto specifically at the expense of ActivityPub (and RSS, a bit). I think you lower yourself by doing this:
ActivityPub
The ActivityPub protocol is a decentralized social networking protocol based upon the [ActivityStreams] 2.0 data format. 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.
Activity Vocabulary
Please check the errata for any errors or issues reported since publication.
Just released an early preview of Zemble, a @zotero.org plugin for @semble.so! - Augment you Zotero library with all of the activity happening on Semble/Atmosphere. - Easily save and view items in Zotero on Semble. - Publish Zotero collections as Semble collections.
I find the idea of using CBOR as an alternative serialization for Activity Streams to be... interesting. w3c.github.io/cbor-ld/
CBOR-LD 1.0
w3c.github.ioATProto Compatible Apps
atproto tools ๐ง
ATProto, Activitypub and FOSS applications
Two protocols, and an acronym. Directories, servers, services and tools that support one or more of these namesakes' or these namestakes' ideals [decentralized, federated etc]. Plus a few wikis for further reading.
userinput.app
Standard Reader (@standard-reader.app)
Airglow | Automations for the AT Protocol
Red Dwarf
Roomy
A quick look at every link that's been added thus far.
Session | Send Messages, Not Metadata. | Private Messenger
NextGraph - Decentralized, encrypted and local-first platform and framework, towards the better internet we all deserve!
Freenet
Berty ยท Berty Technologies
p2panda
What Can They Do?
