looking for heat resistant tomatoes, other veggies

Hello!

I am looking for some good tomato varieties that will withstand the TX heat. I had a couple this year that are still producing despite our drought and hot temps, and would like to try some more. Also if you have any other veggies that have performed well in these conditions I'd be interested. I don't have too much in the way of seeds to offer right now, this is my first full gardening year down here in the heat. I do have some flower seeds I could offer. I could also do postage.

Thanks! Kim