I have an older version of EQ installed on my Mac to use with Parallels, and it never works right.
There is this:
http://www.quiltpro.com/page/QP5_mainpage_Mac
but I don't know anything about it. Maybe someone else here has used it.
I also got an app for my Ipad that is surprisingly user unfriendly. You might try searching for GIMP on this board – a member talks about a basic free program you can use on the Mac.