Audio

13. Audacity 1.2
http://audacity.sourceforge.net/
Windows | Mac | Linux | Portable
This open-source tool sets the bar for what you can do with audio for free. It can record anything you play on your computer and edit it in ways you can't conceive of until you start playing around. Limitations, such as no native MP3 export, are overcome by free plug-ins. If you want to podcast or mix music on the cheap, Audicity is what you need.
• Read PCMag's review of Audacity 1.2.

14. Foobar2000 1.0.1
http://www.foobar2000.org/
Windows
Want to play just about any kind of audio file you can imagine in Windows? Foobar2000 1.0.1 has you covered. Its extensive set of additional components ensures a smooth process for working with compressed files, burning CDs, and even adding Dolby 5.1 surround sound support when you listen through headphones.

15. MP3 Skype Recorder 1.9.0
http://voipcallrecording.com/
Windows
You might be shocked to learn that this software records Skype calls to MP3 format. Yeah, that's it, but MP3 Skype Recorder does it incredibly well. It even saves the call as mono or stereo tracks, with an adjustable bit rate. There are no time limits or file size limitations. It even records SkypeOut calls to regular phones or conference calls with multiple people.