GNUnet is a free software framework for decentralized, peer-to-peer networking and an official GNU package. Developed by Christian Grothoff
License: Open Source
GNUnet is a robust, decentralized network emphasizing security and privacy, making it suitable for users concerned about censorship and data protection. In contrast, Calypso focuses on user experience and efficiency, appealing to developers and users looking for straightforward integration and community support.