MediaInfo - MediaInfo is a convenient unified display of the most relevant technical and tag data for video and audio files
VLC Media Player - VLC is a free and open source cross-platform multimedia player and framework.
VideoSpec - VideoSpec is a free AppleScript studio App (Xcode 3.
AIMP - AIMP : Free Audio Player : Официальный сайт программы
MediaInfoXP - GUI for MediaInfo, an open source tool for displaying technical information about media files.
foobar2000 - An advanced freeware audio player for the Windows platform.