SoundHack is a soundfile processing program, It performs many utility and esoteric sound processing functions available nowhere else
Time stretching or pitch shifting with the phase vocoder or varispeed.
Spatialize with the binaural filter.
Cross-synthesis between two soundfiles with soundfile convolution, ring modulation or spectral mutation.
Noise reduction, spectral expansion or compression with the spectral dynamics processor.
Separate transient and steady-state components with the spectral extractor.
Use your own spectral algorithm with spectral analysis/resynthesis and the spectral assistant example code.
Save sonograms of your soundfile in QuickTime movies or convert QuickTime movies into sound by sonographic analysis.
Freeware by SoundHack