ActivityPub

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Implementations

The social networking software, Mastodon, implemented ActivityPub in version 1.6, released on 2017-09-10. It is intended that ActivityPub will offer more security for private messages than the current OStatus protocol does.
Pump.io
Hubzilla (community CMS software platform) implemented ActivityPub from version 2.8 (October 2017) with a plugin.
Nextcloud - Federated service for file hosting
PeerTube - Federated (ActivityPub) video streaming platform using P2P (BitTorrent) directly in the web browser ^[1]
Bridgy Fed - a bridge that converts between webmentions, ActivityPub and OStatus. ^[1]
distbin - a distributed pastebin ^[1]
dokieli - is a clientside editor for decentralised article publishing, annotations and social interactions ^[1]
Kroeg - Serves ActivityPub and has bridges to OStatus.^[1]
places.pub - places.pub is a place server for the ActivityPub network.^[1]
Pubstrate - ActivityPub / ActivityStreams focused social networking application written in Guile.^[1]
Smilodon - an unfinished client for Pylodon server^[1]
tags.pub - tags.pub is a hashtag server for the ActivityPub network.^[1]
Pleroma - a federated social networking platform, compatible with GNU social and other OStatus implementations.^[2]
Funkwhale - A federated music server^[3]
Plume Project - Federated blog engine that supports ActivityPub^[4]
Pixelfed - Image hosting software