What they said, the square frame jobber is an English wheel, and the other one is a hand shear / guillotine. They can cut bar etc too, capacity depends on size (that is, blade length, normally) and rigidity, but is usually surprising.
Sadly they both look pretty rusty. The useful parts on the English wheel are the rollers, and - since its for panel work, they need to be tip top and smooth. Since at least one of them will be a compound curve, machining to clean them up will probably not be cost effective...
Depending on the state of the hand shear blades, they might just need cleaning up or they might need hard-facing/regrinding / replacing. I would have been interested in the shear, but the condition puts me off.

Nice to find lying around though - got any more oddball tools you want rid of...?

Al.