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.
Pleroma : Pleroma is a federated social networking platform, compatible with GNU social and other OStatus implementations. It is free software licensed under th...
PrePostPrint : PrePostPrint highlights experimental publications made with free software.
Fireworq : Fireworq is a lightweight, high-performance, language-independent job queue system.
Sonic Pi : Sonic Pi is a new kind of musical instrument. Instead of strumming strings or whacking things with sticks - you write code - live.
Sonic Pi is a compl...
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.