Open-source anonymity networks

6 anonymity networks whose code is public under an OSI-approved license, rated for privacy with evidence. Picks first, then by score.

1. Tor Grade A

   Anonymity network that routes traffic through three volunteer-run relays with layered encryption, used through Tor Browser and other apps to hide location, resist tracking and bypass censorship.

   BSD-3-Clause. Source releases are published at dist.torproject.org. The Tor GitLab now requires sign-in to view files. Source code

2. Nym Grade B

   Decentralized mixnet that routes packets through layers of mix nodes with timing delays and cover traffic to hide metadata, used mainly through the NymVPN app.

   Applications are GPL-3.0 and libraries Apache-2.0 or MIT. Source code

3. Hyphanet Grade B

   Peer-to-peer network for censorship-resistant publishing and communication, formerly called Freenet, with a distributed data store and an optional friend-to-friend mode. The Freenet name now belongs to a separate project.

   GPL-2.0. Source code

4. I2P Grade B

   Anonymous overlay network that routes traffic through encrypted, unidirectional tunnels between peers, used mainly for hidden services, messaging and file sharing inside the network.

   Free licenses listed per component (mostly public domain, BSD, GPL and MIT). Source code

5. Lokinet Grade B

   Onion-routed anonymity network that runs over a decentralized set of staked service nodes, tunneling any IP traffic and hosting private .loki services.

   GPL-3.0. Source code

6. Yggdrasil Grade B

   Experimental decentralized mesh network that gives each node an IPv6 address and routes end-to-end encrypted traffic between peers; the project states it does not aim to provide anonymity.

   LGPL-3.0 with a linking exception. Source code

Compare all 6 anonymity networks, open source or not.