AirMyPC by AirMyPC is a piece of software that is capable of mirroring the screen of your computer to your Apple TV device. Sadly, there is no version of AirMyPC for Mac available on the market, but there are other applications AirPlay apps for Mac. Here is a list of replacements for AirMyPC for Mac.
Feel free to add any alternative to AirMyPC for Mac that you know of.
Suggest Alternatives
Actually, if your Mac supports AirPlay, you don't need additional apps mirroring it to Apple...