Info: Manipulating Audio Files in Windows , Linux

http://en.wikipedia.org/wiki/SoX
http://www.thegeekstuff.com/2009/05/sound-exchange-sox-15-examples-to-manipulate-audio-files/

Software: Find alternative software for popular ones

http://alternativeto.net/

Info: Fiddler Web Debugger

 This is a good tool to know what request is going out from the browser  . Also what response you get from the remote domain . Moreover ,this is a free tool .

This works with IE ,firefox and Google Chrome . 

http://www.fiddler2.com/fiddler2/ 

System requirement : 

Windows 2000 / XP / 2003 / Vista with Microsoft .NET Framework v2.0 or later
10 megabytes disk space / 800mhz processor (Screams at 2.4ghz)
128 megabytes RAM (512mb+ highly recommended)