Friendica!

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.

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).

Social networking in a box. Build a social network for your company, school, sports team or niche community all based on the power and flexibility of WordPress. Install BuddyPress directly through your WordPress dashboard plugins page, or download it manually from the WordPress.org plugins repository.

Steemit gives users monetary rewards for any meaningful contribution to the platform. Of these contributions the most important are:- Creating or posting content which the other users consider valuable (like)- Finding valuable content and upvoting it

Tired of seeing ads and promotions in your timeline, being disrupted by tweets from bots and people you don't like, or just want a pure Twitter experience back like the good old days? Try Twidere for Twitter!

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