Gab!

Diaspora is a federated social networking service, designed to be a more privacy-aware alternative to Facebook . Share what you want, with whom you want.

Mastodon is a decentralized microblogging engine, an alternative implementation of the Gnu Social project.

Friendica is a distributed social network application which runs on commodity hosting platforms - PHP/MySQL/Apache. (If you can install Drupal or Wordpress you can probably install Friendica)

GNU social is a continuation of the StatusNet project. It is social communication software for both public and private communications. It is widely supported and has a large userbase. It is already used by the Free Software Foundation, and Richard Stallman himself.

Hubzilla is a powerful platform for creating interconnected based websites featuring a decentralized identity, communications, and permissions framework built using common webserver technology. Hubzilla is very suitable for communities (of any size).

Our philosophy is that your data are yours and you must always be in control. Movim achieves this through a complete decentralisation of users' data and accounts.

Ello is a simple, beautiful, and ad-free social network created by a small group of artists and designers.

ZeroMe - Social network for the distributed P2P network zeroNet

kune is a social network where you can communicate, collaborate and share between equals, using different web tools: documents, calendars, chats, wiki, messages, tasks, forums, barters.