GNU social is a continuation of the StatusNet project. It is social communication software for both public and private communications.
License: Open Source
Gnu Social is primarily focused on microblogging and offers a decentralized platform with extensive customization options, while Friendica provides a broader social networking experience with a strong emphasis on privacy and integration with other platforms. Both are open-source and cater to users interested in decentralized social media, but they serve slightly different purposes.