Mastodon is an online, self-hosted social media, and social networking service. It allows anyone to host their own server node in the network, and its various separately operated user bases are federated across many different servers.

An alternative web client for Mastodon, focused on speed and simplicity.

Element (previously Riot) is an all-in-one secure chat app for teams, friends and organisations. Keeps conversations in your control, safe from data-mining and ads. Talk to everyone through the open global Matrix network, protected by proper end-to-end encryption. (additionally, I host a Matrix server at matrix.werefox.cafe)

A painless self-hosted Git service. Gitea is a community managed lightweight code hosting solution written in Go. It is published under the MIT license.