Ripen the green tomatoes? Why bother, you can get those red things at your local supermarket (On the other hand, you could just add the green ones to the compost- but some of the recipes make for good eating).
RangerSteve's soggy pie problem. There seem to be a lot of green tomato pie recipes (never made tomato pie, so no experience). Some address the problem by adding a tablespoon of tapioca flour or other thickeners. Type of tomato would make a difference; some recommend 'Roma' type.
Another way would be to dehydrate the toms, in the oven or sun (already short cool days where I am- Thanksgiving next week here).

Years ago, a hospital lab here discarded some dehydrators; solid oak cabinets with a glass window door, and electric heating elements. Kept out of the way on a porch, it was ideal. We used it mostly to dry wild mushrooms (including puffball, see thread currently running). Several generations of metal dehydrators probably have been used and discarded by now, but check local auctions of discarded government items. A good new dehydrator is expensive.