Shadowsocks is an open-source proxy project, widely used in mainland China to circumvent Internet censorship. Developed by clowwindy
License: Open Source
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
Shadowsocks is designed for speed and ease of use, making it ideal for bypassing censorship and streaming content. In contrast, I2P focuses on anonymity and privacy, making it better suited for secure communications and hidden services.