Pleroma : Pleroma is a federated social networking platform, compatible with GNU social and other OStatus implementations. It is free software licensed under th...
pump.io : Social server with an ActivityStreams API. It's a stream server that does most of what people really want from a social network.
librehosters : librehosters is a network of cooperation and solidarity that uses free software to encourage decentralisation through federation and distributed platf...
Known : Known is a social learning platform.
Create your educational community and empower students to publish work, share feedback, and communicate across so...
Shariff : Shariff enables website users to share their favorite content without compromising their privacy.
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.