Audacity is the great audio recorder and editor.

Audacity is a wonderful and free software which is very easy to use. It's so fast multi-trace audio recorder and editor. You can edit and record audio with Audacity. It is supported  Windows,
Linux, Mac OS X and other operating systems. You can copy, cut, mix

sound and also change the recording speed. It is an open source software so you can easily use it in Firefox, Open office suite and Ubuntu. It supports also WAV, Ogg, MP3 etc. 

You can download it now