VLC

VLC media player, also known as VideoLAN Client, is an open source multimedia player that supports many file formats.

Compatibility
VLC is fully compatible with Mac OS X and macOS, but was never made available for classic Mac OS.

Other platforms

 * iOS 9 and later
 * tvOS 9 and later
 * Android
 * BSD (Unix)
 * Chrome OS
 * Linux
 * Windows XP and later
 * Windows XP and later
 * Windows XP and later