There isn't a MAC version for EQ.
But the newer Mac's that have an Intel chip can be partitioned (hard drive) to set up a windows environment.
I know, heresy. ;-)
My friend wanted to do this and her husband, a Mac enthusiast, was appalled. APPALLED.
But the down side is the user also has to buy a full copy of Windows, plus the cost of EQ7.
And you have to, I think, reboot each time you want to use EQ as both systems can't be running at the same time. I think.
QuiltPro has a pure Mac version.
http://quiltpro.com/page/QP5_mainpage_Mac
Wow, and way cheaper than EQ.