All in one player--Mplayer

this software is the best alternative for

windows media player
real player.
Quick time player
Divx player

It supports all these formats as well as many other codecs which is not supported by above player
U can find all existing codecs in this .Also it Converts some formats to avi , mpeg ,mp4, divx.
it also plays gaming videos and even grabs video from v4L devices.
It has many skins too.
note:u can download using bittorrent also.
So install this software and u can remove all other player and converters.So this all in one enjoy

[Download Mplayer Here]