Microblogging software

Tumblr ( ) is a microblogging and social media platform founded by David Karp in 2007 and is owned by American company Automattic. The service allows users to post multimedia and other content to a short-form blog. It was also noted for being socially progressive in the 2010s.

free and open-source federated social networking project

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.

free and open source software microblogging server

Gettr (stylized GETTR) is an alt-tech social media platform and microblogging site targeting American conservatives. It was founded by Jason Miller, a former Donald Trump aide, and was officially launched on July 4, 2021. Its user interface and feature set have been described as very similar to those of Twitter.

OStatus is an open standard for decentralized social networking, allowing users on one service to send and receive status updates with users from another. The standard describes how a suite of various standards, including Atom, Activity Streams, WebSub, Salmon, and WebFinger, can be used together, which enables different microblogging server implementations to communicate status updates between their users back-and-forth, in near real-time.

free and open-source federated social networking service

open source social networking software

Tweetie was a client for the social networking service Twitter. There was a mobile version that ran on iPhone, iPod Touch, and iPad, and a desktop version ran on Mac OS X Leopard, Snow Leopard and Lion (respectively 10.5, 10.6 and 10.7).

Misskey () is an open source, federated, social networking service created in 2014 by Japanese software engineer Eiji "syuilo" Shinoda. Misskey uses the ActivityPub protocol for federation, allowing users to interact between independent Misskey instances, and other ActivityPub compatible platforms. Misskey is generally considered to be part of the Fediverse.

blog software

pump.io is an implementation of a social networking service built on a common communication protocol that can be used in a federated social network. Started by Evan Prodromou, it is a follow-up to his previous microblogging software StatusNet (later merged into GNU social) and its OStatus protocol. It is designed to be more lightweight and usable for general activity streams instead of the predecessor's focus on microblogging timelines, with its goal being to achieve "most of what people want from a social network".

Twitterrific was a macOS and iOS client for the social networking site Twitter created by The Iconfactory and was the first Twitter desktop client to come to macOS. It lets users view "tweets" or micro-blog posts on the Twitter website in real time as well as publish their own. Twitterrific is closed source software.