Unfortunately there is no native SeeYou application for the Mac at this moment.
Pilots are however successfully using the following virtualization platforms to run SeeYou on Mac:
- Parallels - it is the most widely used Windows virtualization by SeeYou users. It works great and integrates nicely with OS X.
- VM Ware Fusion - offered by the famous virtualization provider VM Ware. Also works great for SeeYou particularly if you need to communicate with external devices
CrossOver for Mac - it is a port of Wine for the Mac. Doesn't need a Windows license to run (as opposed to the other two solutions above).