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
I2P focuses on providing strong anonymity and access to hidden services, making it ideal for users seeking privacy. In contrast, ZeroNet offers a more user-friendly experience with features for offline access and decentralized hosting, but with less emphasis on anonymity.