foobar2000 - An advanced freeware audio player for the Windows platform.
Clementine - Clementine is a cross-platform free and open source music player and library organizer based on...
MusicBee - While iTunes might be the benchmark music organizer and player app, MusicBee is a strong alternative that many prefer.
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.
VLC Media Player - VLC is a free and open source cross-platform multimedia player and framework.
iTunes - Media player, media library, Internet radio broadcaster, and iPhone device management application