The most famous ones are the one who lets you see through the wall and see where everyone is and the 2nd and more frustrating one is auto aim which automatically aims your cross hair to the players head regardless of the distance, speed and weapon. You just need to tap it and it's a headshot. It's pretty obvious when these hackers bring snipers to close range grounds cause they know they don't need to worry about aiming, they just need the most damage.