Bob,
For a Mac (non-evil OS?) there's iSpectrum
http://www.dogparksoftware.com/iSpectrum.html
It's free but unsupported.
Probably doesn't tick all your boxes though. Dogparksoftware also make
MultiMode (not free) which has some FFT facilities.
Also free: Sonogram The Software should run on MS Windows (98, 2000,
XP and Vista), PC-Linux, Sun Solaris, and Mac OS X.
http://www.christoph-lauer.de/Homepage/Sonogram.html and
http://sourceforge.net/projects/sonogram/
Martin
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