Heck I'm not even sure if they make them any more but I have a Buck Selector. It has interchangeable blades. For mine I have the drop point blade, a gutting blade and a saw.
I've owned this knife for about 25 years and before that I used a Kabar folding knife with 2 blades. One for gutting the other was a swept blade for skinning. Both are still good solid knives.