Alpha Anywhere is a Windows application, but can run under Parallels or other virtualization software.
You can install Alpha Anywhere on a PC and then connect to that PC using remote Desktop, or you can install Windows on your Mac using Parallels or virtualization software. Both methods have been tested and perform well. For best results with Parallels, open the Windows Task Manager and stop the prl_cc process from running. This process sometimes misbehaves and makes Windows run slowly.