Nek

The Network Event Kit is hardware and software to deploy event networks for open source, open content, open hardware.
It's purpose it to be fast to deploy and low cost. The NEK gives access to internet via a wired and wireless infrastructure. This works on opensource software and is documented online.
However it is more the just this kit. The idea behind the NEK is to create cooperation and train people to use open software on events.
http://bsd.wifisoft.org/nek/