Some of them will ripen on the kitchen counter, but my favorite thing to do with them is make what we call Chow-Chow. A special Autumn relish, which nicely pairs with meat or even on a sandwich.
It is a recipe I have used for a very long time and thought you might also enjoy it.
20 medium green tomatoes
8 large apples (unpeeled) I like to use Granny Smith here.
8 medium sized onions
3 green peppers
2 red peppers
1 tablespoon each of salt, celery seed, mustard seed, turmeric, cinnamon
5 cups sugar
3 cups apple cider vinegar
Grind all the vegetables and drain well.
Put into a large kettle, add seasonings, sugar, and vinegar.
Bring to a boil and cook 30 minutes.
Put into jars and seal.
Note: I seal without a water bath, but keep everything very hot.
You may feel safer to use a water bath, whatever makes you most comfortable here.