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

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 …

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

Minds is an open source social networking service.

BuddyPress inherits and extends upon the integral functional elements of the WordPress engine including themes, plugins, and widgets.

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.

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.