Cool Edit
http://store.adobe.com/store/product...id=catAudition

Cool Edit Pro

http://www.adobe.com/special/product...ntrillium.html

Audacity

http://audacity.sourceforge.net/

GOLD WAVE
http://www.goldwave.com/

Sonic Spot
http://www.sonicspot.com/cooledit/cooledit.html http://www.sonicspot.com/sampleeditors.html