VLC (VLC Player, VLC Media Player, VLC Viewer)

Website/Download: http://www.videolan.org/vlc/
License: Freeware
OS: Windows Mac Linux
Latest Version:
Publisher's description:
VLC media player is a highly portable multimedia player and multimedia framework capable of reading most audio and video formats (MPEG-2, MPEG-4, H.264, DivX, MPEG-1, mp3, ogg, aac ...) as well as DVDs, Audio CDs VCDs, and various streaming protocols. See the full features list.
It can also be used as a media converter or a server to stream in unicast or multicast in IPv4 or IPv6 on networks.