There are a lot of Kickstarter projects out there, and this is by far one of the best. iEmu is a project started by Chris Wade, who also happens to be jailbreak developer. Apple currently provides an iDevice simulator to developers, but it is lacking in a lot of areas, including only being able to run apps developed by the developer that's testing.
iEmu is an emulator that can emulate any iDevice, including the Apple TV. What makes iEmu so special is that it is cross-platform. This includes the Mac, PC, iOS, and even Android...