A self-hosted, single-user, ActivityPub powered microblog. Fully compatible with the Fediverse. Also implements Indieauth. No Javascript - HTML and CSS only! Uses poussetaches for its activity queue. Offers RSS, ATOM, and JSON feeds. Has a minimal API.

Maybe use this as a scrobbling server?

A federated microblogging application written in node.js. Replaces Twitter. Implements ActivityPub so it's already part of the Fediverse.

A URL shortening service for posting links to Twitter, identi.ca, or any other service you like. There is even an option to generate a QRcode out of a URL.

Salut à Toi is a communications framework built on top of XMPP (and all that brings with it) which implements messaging, microblogging, file sharing, e-mail (with a regular mail client), and more. Wherever there is an XMPP server, you can use it. Has multiple front-ends, including a web interface and a desktop client. Written in Python, uses Twisted and Wokkel.