A rubber strap wrench
I love this one that is mounted under my upper cabinets... as do the kids!
https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1
I do this with a butter knife
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I bang them on the counter until it clicks.
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I love this jar key popper! It’s cheaper, very small, no sharp edges, and easy enough that my youngest has been able to use it. You can get them everywhere.
https://www.bedbathandbeyond.com/sto...E&gclsrc=aw.ds
I have an Oxo Good Grips Jar Opener with metal on both sides. Got one for my mother as well. We both really like them.
https://m.jcpenney.com/p/oxo-good-gr...xoCKOgQAvD_BwE