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.
Simple, fast and powerful media player. Plays everything: Files, Discs, Webcams, Devices and Streams. Plays most codecs with no codec packs needed: MPEG-2, DivX, H.264, MKV, WebM, WMV, MP3… Runs on all platforms: Windows, Linux, Mac OS X, Unix… Completely Free, no spyware, no ads and no user tracking. Can do media conversion and streaming.