Wartime progress in everything from radio to radar to rocketry has led directly to modern communications tech including satellites and microwave links.

When WW2 started, a "computer" wore a dress to work and was "programmed" to watch meters, turn knobs, do a lot of arithmetic by hand, and avoid asking questions. When WW2 ended a "computer" was a machine with a rapidly-increasing number of uses.

Before WW2, aircraft used propellers, flew slow and low, and crashed a lot. After WW2, the jet age ramped up practically overnight thanks to experience gained by all sides.

And yes, we got pesticides, herbicides, synthetic fuel and rubber processes, mass-produced antibiotics, probably a bunch of other stuff I'm not thinking of.

Then there's the whole Pax Americana thing, which is the part we're busy throwing away right now. It led to a relatively peaceful, stable global environment in which new technologies could emerge and spread without the need for a world war to inspire them. Now that America has basically been subverted from within, we'll soon get to find out whether that was a good thing for the world or not.