Scid vs. PC do.
http://scidvspc.sourceforge.net/
New Mac equipment. How to get the most 'chess' out of it?
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Unfortunately, SigmaChess is a PowerPC app, no longer supported on the newest Mac OS (10.7 Lion).
AFAICT, there are no other free Mac apps that support UCI engines.
http://macupdate.com/find/mac/chess