Wikipedia
Netsukuku
Netsukuku is the name of an experimental peer-to-peer routing system, developed by the FreakNet MediaLab in 2005, created to build up a distributed network, anonymous and censorship-free, fully independent but not necessarily separated from the Internet, without the support of any server, ISP and no central authority.
Netsukuku is designed to handle up to 2 nodes without any servers or central systems, with minimal CPU and memory resources. This mesh network can be built using existing network infrastructure components such as Wi-Fi.
The project has been in slow development since 2005, never abandoning a beta state. It has also never been tested on large scale.