Audio Editor 
Audio Extractor 
Audio Player 
Tag Editor 
Media Player Classic - Home Cinema is a lightweight Open Source audio and video player.
Audacity
Audacity is a powerful open source audio recorder and editor software.
CDex
CDex is an open source Digital Audio CD extractor. You can extract audio data to plain WAV files but also to compressed format like: MP3, OGG.
EasyTag
EasyTag is an open source tag editor for various types of audio file.
