I2P

I2P (Invisible Internet Project) is a computer network layer 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. The software is free and open source and is published under multiple licenses. The name I2P is derived from Invisible Internet Project, which, in pseudo-mathematical notation, is represented as I²P.

Read more about I2P:  Technical Design, Software, Terminology

Other articles related to "i2p":

I2P - Terminology
... that are hosted anonymously within the I2P network ... Eepsite names end in.i2p, such as ugha.i2p or forum.i2p ... sites through the cryptographic identifier keys stored in the hosts.txt file found within the I2P program directory ...