When I have extra tomatoes I slow roast them at 200 degrees for 8-12 hours with a little extra virgin Olive Oil and I crush fresh salt and pepper on them when I pull them out of oven.
The flavor of the tomato gets concentrated and is very sweet. Even those cardboard like supermarket tomatoes turn delicious this way. They are excellent in a varity of ways including entrees, pizzas or grilled sandwiches.
They stay good in the frig for about 10 days so I usually never have to freeze them but I have once and they froze and thawed well.