Audacity is a free, easy-to-use, multi-track audio editor and recorder for Windows, Mac OS X, GNU/Linux and other operating systems. The interface is translated into many languages. You can use Audacity to:
Source: Audacity: About Audacity Unknown. "Audacity: About Audacity." Audacity.sourceforge.net, n.d. Web. 23 Mar 2014. .
"Audacity. How To Have Fun With Sound by “Audacitydemo”. This presentation is licensed under the Creative Commons Attribution 3.0 License."
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Source: Audacity: Free Audio Editor and Recorder Unknown. "Audacity: Free Audio Editor and Recorder." Audacity.sourceforge.net, 2014. Web. 23 Mar 2014. .
How to Download and Install Audacity.
How to record narration and other audio with Audacity.
Editing audio with Audacity.