This one is really awesome, but these are custom made, I assume... for the master soap makers. Got this picture from MarieGale.com. There's a whole series of soap cutting pictures I just love.
Then for the serious bulk soap makers, there are people who make enormous soap cubes. This is a H1H hydraulic machine that can cut blocks of cold process soaps into bars, producing in excess of 1000 lbs of force to cut soap. Here are pictures but you should got to the website for a look see.