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 an open-source, decentralized social networking platform that emphasizes user control and customization, while App.net is a premium service focused on developers and privacy, offering a more polished and professional experience. Gnu Social is ideal for users who prioritize open-source solutions and self-hosting, whereas App.net is suited for those looking for a more structured and ad-free environment.