I noticed today that there is now a beta of Gizmo 4 available for the Mac. This is significant because I don't believe that there are currently any other NIT-Mac clients (if there are, I'd love to hear about it).

From my limited testing on a home LAN (which was presumably going out and back in again over the NATed connection), the quality of the picture was horrible, especially from the n810 camera, but it might be better under optimal circumstances. It *did* seem to (mostly) work, though, which means that Mac users now actually have an option of video calling.