The Invisible Internet Project (I2P) is a garlic routing using overlay network and darknet that allows applications to send messages to each other pseudonymously and securely. Uses include anonymous Web surfing, chatting, blogging and file transfers. The software that implements this layer is called an I2P router and a computer running I2P is called an I2P node.
License: Open Source
Tor and I2P are both privacy-focused networks, but they serve different purposes. Tor is ideal for accessing the surface web anonymously and is easier to use, while I2P excels in peer-to-peer applications and offers stronger resistance to traffic analysis.