A free program for Android, by App Dynamic.

AirServer® is an optional companion app for the Android-based AirPlay® mirroring sender, allowing you to project your Android screen wirelessly, not just to one, but to multiple Apple TV®s and computers running AirServer at the same time. You can connect to any of them from your Android device, and screen mirroring will automatically start. You can use the built-in screen mirroring and screen-casting capabilities of the Android device to send what you see on your device to multiple Apple TVs and/or computers at the same time.