VideoLAN, a project and a non-profit organization.

VLC media player

VLC is a free and open source cross-platform multimedia player and framework that plays most multimedia files as well as DVDs, Audio CDs, VCDs, and various streaming protocols.

Download VLC

Simple, fast and powerful

Plays everything - Files, Discs, Webcams, Devices and Streams.
Plays most codecs with no codec packs needed - MPEG-2, MPEG-4, H.264, MKV, WebM, WMV, MP3...
Runs on all platforms - Windows, Linux, Mac OS X, Unix, iOS, Android ...
Completely Free - no spyware, no ads, and no user tracking.