Sigmira is a Windows application program for decoding various "Ham"
radio signals. Its features include:

-Selectable demodulation of PSK31, RTTY, and CW "digital" modes.
-"Waterfall" spectrographic display.
-Point and click signal selection/tuning.
-'Live' input from a shortwave receiver to a standard PC sound interface
or canned input from saved .wav files.
-16 bit sampling. 8 k-sample/s sampling rate.
-Signal strength meter.
-Adjustable squelch.
-Clock display with UTC and local time.


The distribution package includes examples of PSK31, RTTY, and CW
signals in .wav files.

And it's free.

http://www.saharlow.com/technology/sigmira/index.htm