From here a cursory glance without magnifying shows perhaps late blight and Septoria leaf spot. Tons of threads on this board covering both and more.

Dan

If I were you, I would continue to water and fertilize those plants and see what happens. I have had plenty of tomato plants that look worse than yours that still produced an abundant crop. To tell the truth, I have some right now. They have some kind of blight. They get it every year. I garden organically, so I don't spray, but I still get lots of good tomatoes. It's getting late in the season. It's about getting what you can now. I would dispose of all those vines in the garbage (not the compost pile), rake all debris off the beds and dispose of it too, put down fresh mulch for winter, and plan to add some good compost to the bed next year. Then, plant some crop besides tomatoes (or pepper or eggplants) in that spot. I bet you'll be fine.

Oh, and, if it really bothers you, take a sample of the foliage to your County Extension Agent and ask for advice on how to avoid the problem next year.

If you choose to leave those plants in ground clean up all the leaf litter after you pull them or you'll relive this every year.