VLC Media Player - VLC is a free and open source cross-platform multimedia player and framework.
Audacity - Audacity is a free and open-source audio production software suite that includes a surprising array of editing tools and recording systems.
foobar2000 - An advanced freeware audio player for the Windows platform.
Oceanaudio - Ocenaudio is a cross-platform, easy to use, fast and functional audio editor.
Winamp - Winamp is a media player that allows users to play multiple-file formats, arrange media in a varied file-management system, and play unique media with AAC encoding.
GoldWave - GoldWave. Digital Audio Editing Software. Record • Restore • Convert • Analyze. Fully loaded to do everything from the simplest recording and editing to the most sophisticated audio processing, restoration, enhancements, analysis, and conversions.