Kantaris
Kantaris is an open-source media player that boasts that it can play almost anything you throw at it - all AVI, MPEG, MGEG-AVC, WMV, MOV, MKV, quicktime, matroska, divx, xvid, H264, MP3, WMA, OGG files and more.
Kantaris has a simple graphical interface that is very similar to that of Windows Media Player. The program is VLC-based and is able to read CDs and DVDs. One of the best things about the program is just how easy it is to use making it perfect for neophytes.