My inlaws recently got a notice from their ISP stating that they are going over their limit. I'm trying to set something up to help them monitor usage, possibly down to giving everyone in the family or every device (whichever is easier / better) a unique login or identifier. The idea being that they can track who or what is causing the overage.
Right now, they have a basic wireless router, but I can lend them a server if that would help. It currently has Windows 2003 on it, but I can wipe it and install Linux on it. I'm just much more familiar with Windows.