There is a thread on this topic already being discussed here. It should answer your questions.

Rodney

Here is a link that might be useful: What to plant now (early July) in zone 5?

Summer Squash, Beans,

Also Tomato, Pepper and Eggplant transplants

I don't grow eggplant so don't know if there are short (60 DTM) varieties - maybe some of the mini (Asian) kinds? Getting late for peppers too unless you want to try them in pots and overwinter them. Again, for tomatoes look for short-season determinates.

When is your first fall frost date? Mid-late Sept? Could get some tomatoes from transplants but not many if you end up with late-season variety like Brandywine.

See the thread Rodney linked to for fall veggies to start this month. I linked a fall planting calculator from Johnny's there.