I'm not familiar with Mac, but there are two out there that I know of---ABR Viewer, which crashes my system, never loads, and you can only preview one set at a time, and it takes FOREVER, and ABR View, which is very similar, but much less powerful (errr---meaning kind of useless?) and frustrating.
I have not found a sufficient method of previewing, short of previewing each set, doing a screen capture, and printing it out and putting it in a binder. Because I've not found something good, I have sadly underutilized my brushes.
So, I would recommend if you have the $15 and the full version will do what you want, buy it. It would probably be very worth it in the end.
***Edit--I just googled and found "BrushView QuickLook plugin" for Mac, it's free, and it works with QuickLook. Don't know what that is, but it looks easy to install. You might want to check that out.***
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Sarah 
Equipment: Canon T2i (550D) with 18-55mm f/3.5-5.6, 55-250mm f/4-5.6, 50mm f/1.8, and 400mm f/5.6L lenses
Software: Windows 7, PSE 6.0 (Editor and Organizer), and PSCS 4
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