gTuner has many features macintosh users and guitar players really need: first of all it helps you to tune your guitar - either in auto-mode, in which gTuner finds the matching string or in the manual-mode, where you can select the current string and tune guitars that are badly out of tune.
Mac OS X 10.3
Mac OS X 10.2
||Mac OS X 10.2 or later. PowerPC-equipped Macintosh. Mac OS X supported audio input device.