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GNUnet is a freely available software framework that is used for decentralized, peer-to-peer networking that does not support any centralized activity. This is part of the GNU project and is therefore released under the GNU General Public License, which makes it free to use and modify. This framework is mainly coded using C language but there is a project to make a version using Java. GNUnet provides network services like link encryption, peer discovery and allocation of resources. It is compatible with Windows, Mac OS X, GNU/Linux and Solaris.