This article discusses software internally used by Apple.
Acquiring a copy without Apple's consent is illegal and may result in being scammed.
ScreenShotr is an Internal Mac OS X Application used for taking screenshots of prototype devices/ devices running internal SwitchBoard.app firmwares. It appears to take the screenshots at the device's native resolution. It also appears to be able to take screenshots of devices which have been ran through Xcode and have the Developer preference bundle.