GNUnet is described as 'Framework for secure peer-to-peer networking that does not use any centralized or otherwise trusted services. A first service implemented on top of the networking layer allows anonymous censorship-resistant file-sharing' and is a popular anonymizing network in the file sharing category. There are more than 50 alternatives to GNUnet for a variety of platforms, including Windows, Linux, Mac, Android and BSD apps. The best GNUnet alternative is Tor, which is both free and Open Source. Other great apps like GNUnet are Matrix, I2P, IPFS and Hyphanet.