The cheese knife has holes in the blade to keep soft cheeses from sticking to it. You can also use the prongs at the top to pick up cheese pieces for placing or serving.
The cleaver is for cutting hard cheeses. The wide blade and shape allow the cutter to use force and balance to push down and cut slices. The placement of the handle helps to keep your knuckles from hitting the board.
The shavers allows you to shave thin, melt-in-your-mouth slices.