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 app in the File Sharing category. There are more than 100 alternatives to GNUnet for a variety of platforms, including Windows, Mac, Linux, Android and iPhone. The best alternative is Tor Browser, which is both free and Open Source. Other great apps like GNUnet are Tor (Free, Open Source), Matrix.org (Free, Open Source), ProtonVPN (Freemium, Open Source) and IPFS (Free, Open Source).
The Tor software protects you by bouncing your communications around a distributed network of relays run by volunteers all around the world: it prevents somebody watching your Internet connection from learning what sites you visit, it prevents the sites you visit from learning...
Tor is free software and an open network that helps you defend against traffic analysis, a form of network surveillance that threatens personal freedom and privacy, confidential business activities and relationships, and state security.
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Almost everyone thinks Tor is a great alternative to GNUnet.
Matrix defines a set of open APIs for decentralised communication, suitable for securely publishing, persisting and subscribing to data over a global open federation of servers with no single point of control.
IPFS is a global, versioned, peer-to-peer filesystem. It combines good ideas from Git, BitTorrent, Kademlia, SFS, and the web. It is like a single bittorrent swarm, exchanging git objects. IPFS provides an interface as simple as the HTTP web, but with permanence built in.