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.

Features

• 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.