But seriously, I have no idea, how do they taste? Sweet? Tart? Aromatic? Bitter? Assuming they're not purely ornamental you should be able to make a halfway decent cider.
The trees look pretty healthy, though not much fruit by the looks of it. With minimal upkeep you could easily get a consistent harvest every fall.
The first one looks like a russet apple, they usually make good cider. The second one looks similar to my kid's orange red, but I doubt if that is right. The only way to find out is make some cider.