Does anyone know of any free or open source pieces of software that would allow me to ration internet usage like a motel/cybercafe? Basically I want to be able to give my kids "X" hours of access a week to the internet, in the hope they might do something with their lives other than play facebook games.
Ideally either something that authenticates against an AD (existing at home), or uses a one time random code like many motels etc.