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A basic audio Real Time Analyzer (RTA) / Spectrum analyzer program. It doesn't need to be super-accurate; just able to identify offending (i.e., "feedback") frequencies) when tweaking a PA system, monitors, etc. and give an overall idea of the relative response of a system. Something like Mobile RTA that works on other PDA/Smartphone platforms.
Also, an instrument tuner application. Ideally, it could identify the fundamental frequency as well.