What breed? What will also help in finding what would best suit him.
Can't tell anything of his back from these photos.
Camped under in front a little bit
Toes out in back (though most horses usually to toe-out a little bit, so unless it's worse than what the picture shows, I wouldn't be too concerned.
HIs neck, from what I can tell (though were are no good pictures of his neck) is slight knife necked and neck appears fairly short also...which would make it harder for him to collect himself.
For disciplines, I'd probably go more towards something western. I wouldn't suggest jumping due to he's camped under, but he could. He really could do anything...pictures can't really say what he'd be good for...really see what he likes. A horse that doesn't enjoy doing that you may want to do or what you think he might be good at, isn't good, for he won't have the right attitude. Find something that he enjoys