Sample Wrench Audio Editor and Analyzer
Sample Wrench is an extensive digital audio analysis and editing tool that runs under Windows. Formerly a commercial product for many years, I recently placed this as non-commercial redistributable freeware. It is useful for coursework in electronics, audio, acoustics, music production and the like. Opens and saves .wav and other popular sound files. Waveforms can be viewed in the time domain like a digital oscilloscope and also via 2D and pseudo 3D spectral displays. Features a wide array of editing tools including EQ, filtering, pitch shifting, time compression, spectral warping, etc. Also offers a macro language which allows batch processing and the creation of custom functions.
More information about it can be found at http://www.dissidents.com/audio.htm