ToneTester is a Mac OS X Cocoa application that tests hearing. Specifically, it looks for offsets in how each of a person's ears hears pitch (the formal term for this is "binaural diplacusis" or "interaural pitch difference").
You can find the ToneTester application here (Mac OS X 10.3.9 or later, including 10.5 Leopard).
You can find the source for ToneTester here (XCode 2.5 or later, Mac OS X 10.4 or later).
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