I completely missed seeing this one.
As Kevin has already said, no, Ring's software will not work natively on a Mac. Apart from Parallels or Boot Camp, which I believe you have to pay for the other option is setting up a virtual PC on your Mac using VirtualBox or VM Ware. This option is free* and should work (I haven't tried it when a Mac is the host, only with another PC as the host).
* While VirtualBox and VM Ware player are free, Windows is not and in the interests of appearing to do the correct thing you should have a valid license for the copy of Windows you'd install. There are free evaluation copies of Windows that can be used but they expire after 30 days. There is also a free clone of Windows however the last time I looked, which was quite some time ago now USB support was lacking a lot and the HC / CI-1 were not detected.
- Tim