Apps similar to Full Key Codes include KeyboardTest. It's paid, but Aqua's KeyTest and Keyboard Checker are free. Other options are Keyboard Codes Display and keyview. In total there are five apps like Full Key Codes for Windows and the web.
PassMark KeyboardTest allows users to quickly check that all the keys on their computer keyboard are functioning correctly, check the keyboard LED's, look at the internal scan codes being generated by the keyboard and measure typing speed.
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This great little utility was written by the same Korean keyboard god that also developed the LIMKB keyboard controller.
KeyboardChecker.com is a very simple website where users can check whether all their keyboard keys work properly.
A little program to display the virtual key code and the key value (or the key name for non-character keys) for each key pressed.
