VLC is a free and open source cross-platform media player that plays most multimedia files across the board. It is also a full-fledged audio player, with an equaliser and filters, playing all weird audio formats.
VLC is for everyone, is totally free, has no ads, no in-app purchases, no spyware and is developed by passionate volunteers. Even the source code for this app is available for free.
It supports all formats including MKV, MP4, AVI, MOV, Ogg, FLAC, TS and many more. All codecs are included with no separate downloads. It supports subtitles, teletext and closed captions. It also includes a widget for audio control, supports audio headsets control, cover art and a complete audio media library.
One of the simplest and most versatile media players available online.