A Warcraft 3 mod has been released for CS: Source. It has many similar features to the CS 1.6 version. There are several different races with different skills. As you get more kills, you can upgrade your skills depending on your class. To read more and download the mod, visit this forum thread.

Warcraft 3 Mod: http://www.mattie.info/cs/forums/viewtopic.php?t=1166