VLC Media Player

VLC Media Player is a long-time open-source favorite, and the latest version is also the first to be out of beta development. It's not the only option for free video playback, but it's one of the best, and the feature updates in version 1 make it well worth the upgrade. VLC continues to offer robust support for a wide range of video and audio formats, including OGG, MP2, MP3, MP4, DivX, HD codecs like AES3, and playing back zipped files.