i2pd

I2P (Invisible Internet Protocol) is a universal anonymous network layer.
All communications over I2P are anonymous and end-to-end encrypted, participants don't reveal their real IP addresses.

I2P client is a software used for building and using anonymous I2P networks.
Such networks are commonly used for anonymous peer-to-peer applications (filesharing, cryptocurrencies) and anonymous client-server applications (websites, instant messengers, chat-servers).

I2P allows people from all around the world to communicate and share information without restrictions.

For more information about I2P, you can read article on Wikipedia.