I2P is an anonymizing network, offering a simple layer that identity-sensitive applications can use to securely communicate. All data is wrapped with several layers of encryption, and the network is both distributed and dynamic, with no trusted parties. This is the source code release version.
You can download it from the following link: https://packetstormsecurity.com/files/download/152191/i2psource_0.9.39.tar.bz2
Source: https://packetstormsecurity.com/files/152191/I2P-0.9.39.html