VLC Media Player - VLC is a free and open source cross-platform multimedia player and framework.
Sononym - Finally, a sample browser that understands audio
foobar2000 - An advanced freeware audio player for the Windows platform.
Samplism - Feature-packed, audio asset manager for Mac.
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.
Soundly - Functional music for better sleep, focus and relaxation