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 primarily on anonymity and secure routing for hidden services, making it suitable for users seeking privacy in online activities. In contrast, GNUnet offers a wider range of services and emphasizes decentralized communication and file sharing, appealing to users interested in a comprehensive privacy-centric ecosystem.