BuddyCloud provides tools, libraries and services for secure cloud & on-premise user and group messaging.

Ello is a community to discover, discuss, publish, share and promote the things you are passionate about.

FreezeCrowd is a social networking site for college students and alumni.

Hubzilla is a powerful platform for creating interconnected websites featuring a decentralized identity, communications, and permissions framework.

Known is a publishing platform that allows its users to share their stories online.

Minds is an open source social networking service.

Diaspora is a nonprofit, user-owned, distributed social network that is based upon the free Diaspora software.

Facebook is the world's largest social network platform.

Friendica (Friendika or Mistpark) is open source software for a distributed social network. The focus is on effective privacy settings and easy installation …

HumHub is a free social network software and framework built to give you the tools to make teamwork easy and successful.

Libertree is a free, libre, open-source software that lets people create their own social network.

Movim (My Open Virtual Identity Manager) is a distributed social network built on top of XMPP, a popular open standards communication protocol.