Pirate box
A PirateBox is a portable electronic device, often consisting of a Wi-Fi router and a device for storing information, creating a wireless network that allows users who are connected to share files anonymously and locally. By design, this device is disconnected from the Internet.
The PirateBox was originally designed to exchange data freely under the public domain or under a free license.
heres a wiki on the pirate box
Unfortunatly now un-supported, although the software is still out there , and still works if used on the correct type of Raspberry Pi computer. The main problem seems to be systems not joining on because of security.
Fancy Cats has one to distribute his music… The Fancy Cat hard drive can still be accessed find out about it here