No problem, I should have explained better!
Yes, MadCAM is what will produce the G-code from your 3D model. It is a plugin for Rhino, so cannot run alone. So far it is only available for the windows version of Rhino, however once the software development kit for the Mac version of Rhino is available it should be possible to port it over. When I asked about this a while back, Joakim (MadCAM's developer) indicated that he would be interested in doing so.
Meantime we hurry up and wait, and use the windows version of Rhino with MadCAM to produce the G-code