It's Overwolf, it was an optional install when I downloaded TS3. I like it but I don't know how to get rid of that annoying circle poking out of the lefthand side of my screen... (It's the menu and it expands when you mouse over it)
hey greg i found out how to hide the circle thing just click this thing(not sure what it was called) but it will show the overwolf icon and you just right click and unclick show dock.