I know im bringing up an old thread, however so nobody else who owns a mac and reads this thinking they might as well not try ecuEdit because they have a mac- think again.
I have a Macbook Pro, OS X, and I can run ecuEdit from within Windows (via Boot Camp) or from within OS X (via Parallels). You can install windows on your Mac and run them separately or side by side. I run Windows 7 Pro w/ OS X and Parallels and didnt pay a dime

. So ecuEdit runs fine on a Mac, via Windows.