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No one has created a cheat calculator program for the Mac (that I know of), since most people like to optimise their programs for Windows in C/C++. You could try kpdavatar's online calculator at https://boomspeed.com/kpdavatar/.
xyzman's calculator can create codes for all cheat devices currently on the market. Note that CodeBreaker codes can be used on a GameShark SP (made by Madcatz -- not to be confused with GameShark/Action Replay v1/2 made by Datel).
Kairi posted the link to xyzman's calculator, which is the best in my opinion.