Android: TimeAway gives parents control over their child's Android device. You can monitor and restrict time spent on the device, allow and block apps, and track the current location of the device.
TimeAway is similar to previously featured DinnerTime, but it offers several of DinnerTime's paid features for free. You can add up to six devices on a free account of TimeAway (DinnerTime allows for two), and monitor the usage on each device by day, week or month. Plus, you get app usage statistics.
When locked, it will not run anything without a passcode. Apps can also be individually blocked or imposed with time limits.
Finally, TimeAway can locate the current position of a child, using the built-in GPS of the device.
TimeAway only works on Android devices at the moment, for both parents and kids.