The double barrel is a pinfire, but the cartridges look like they have had the pins taken out (maybe as a safety measure?); can you get a clear close-up of the "S" mark, and maybe see if there are any other marks on the bottoms of the barrels, where they close up against the frame? The "S" might be an old Czech black-powder proofmark, but they usually also have a small "1" or "2" stamped inside the top loop of the "S".
The second one is a typical early American cartridge pistol, of the type known as a "suicide special", but I can't read the full name in your pictures, which would tell us who made it.
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