All software for personal income tax that are certified by Revenue Canada can be found in the following webpage:

http://www.netfile.gc.ca/sftwr-eng.html

You have a few choices when it comes to the MAC:

• you can pick the ones that run on the MAC natively; however, there are only 2
• you can use the ones that are available as web-based services (thus it will work on just about any web browsers)
• you can also use the ones for Windows, if you like one specific package over the others, by running Windows via Bootcamp or VMWare Fusion.

Hope that helps.