I2P

Original author(s)I2P Team
Initial release2003 (2003)
Stable release
2.8.2  / 29 March 2025 (29 March 2025)
Repository
Written inJava
Operating systemCross-platform: Unix-like (Android, Linux, BSD, macOS), Microsoft Windows
Available inEnglish, Spanish
Incomplete translations: Russian, French, Romanian, German, Swedish, Italian, Portuguese, Chinese, Dutch, Polish, Hungarian, Arabic, Japanese, Estonian, Persian
TypeAnonymity application, Overlay network, mix network, garlic router, peer-to-peer
LicensePublic domain, BSD, GPL, MIT (license varies by component)
Websitegeti2p.net

The Invisible Internet Project (I2P) is an anonymous network layer (implemented as a mix network) that allows for censorship-resistant, peer-to-peer communication. Anonymous connections are achieved by encrypting the user's traffic (by using end-to-end encryption), and sending it through a volunteer-run network of roughly 55,000 computers distributed around the world. Given the high number of possible paths the traffic can transit, a third party watching a full connection is unlikely. The software that implements this layer is called an "I2P router", and a computer running I2P is called an "I2P node". I2P is free and open source, and is published under multiple licenses.