PirateBox, the…

“self-contained mobile [wi-fi] collaboration and P2P file sharing device. Simply turn it on to transform any space into a free and open P2P file sharing network. […] the system is purposely not connected to the Internet in order to subvert tracking and preserve user privacy.”

“The PirateBox is registered under the Free Art License (FAL 1.3). It can be built for approximately US $100.”