I have this tool and do not know what it is or what it or was used for it has a adjustable guide to slice material but I do not what

It looks like a tool for shaving wooden doors when they are not even or slightly too big to fit in the door frame. I think it is called a wood plane.

Howstuffworks "Plane" (http://home.howstuffworks.com/plane.htm)

It looks like a "planer" to trim (plane) wood ? Does it have a blade on the bottom or a place for a blade?

In that 3rd picture I believe we are looking at a rotary wheel cutter. I believe this cut be a leather cutter. Not 100% sure because the ones I have seen had a different handle.