VLC media player

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

Features

Simple, Powerful and Fast

Plays everything, Files, Discs (DVD, CD, VCD, Blu-Ray), Webcams and Streams

Plays most codecs with no codec packs needed:
MPEG-2, H.264, DivX, MPEG-4, WebM, WMV player

Completely Free, 0 Spyware, Ads or User Tracking

Works on most platforms: Windows, Linux, Mac OS X, Unix...