Audacity: free audio editing tool

In addition to Jing, a popular free (basic version is free) screen-capture and screencasting tool, Audacity is another favored free, open source software for recording and editing sounds. It is available for Mac OS X, Microsoft Windows, GNU/Linux, and other operating systems. Audacity was voted "Best Project for Multimedia" in the SourceForge.net Community Choice Awards 2009. Audacity version 1.2.6 is a stable release that recommended to all users compare to the latest version 1.3.8. Read CNET and users' reviewson Audacity