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.

VLC can play:

MPEG-1, MPEG-2 and MPEG-4 / DivX files from a hard disk, a CD-ROM drive, and so on

DVDs, VCDs, and Audio CDs

From satellite cards (DVB-S)

Several types of network streams: UDP/RTP Unicast, UDP/RTP Multicast, HTTP, RTSP, MMS, etc.

From acquisition or encoding cards (on GNU/Linux and Windows only)

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, 0 spyware, 0 ads and no user tracking.

Can do media conversion and streaming.