ClearPhone Pro 6.4.8
ClearPhone Pro is one of the best Internet phones.
It's got collaboration capabilities that include video, a white board, voice e-mail and file transfer.
Oh, and it's a cross-platform application, too. Do we have your attention now?
Yes, ClearPhone Pro for the Mac can communicate with the Windows version. The Pro version also allows for 30fps video conferencing if you have a fast Internet connection, too.
How can you beat that?