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:

• Record live audio.
• Record computer playback on any Windows Vista or later machine.
• Convert tapes and records into digital recordings or CDs.
• Edit WAV, AIFF, FLAC, MP2, MP3 or Ogg Vorbis sound files.
• AC3, M4A/M4R (AAC), WMA and other formats supported using optional libraries.
• Cut, copy, splice or mix sounds together.
• Numerous effects including change the speed or pitch of a recording.
• And more! See the complete list of features.

Visit Audacity at AudacityTeam.org. There you can get the latest information and downloads.