Eastern PA, same county as Paul Lutz above (hi sort-of neighbor!) but I live a bit south of him on a shaded north-facing slope (lack of sunlight even in clear areas is a problem), 1100 ft elevation, very stony loam soil (though most of my growing area is well into the subsoil since it was carved out of the hill). Koppen climate zone is Dfa, hardiness zone is right on the dividing line between 6a and 6b (even with the polar vortex this year, we haven't hit 6a temperatures in the 30+ years I've lived here).
Fruits & nuts that I've established (or my immediate neighbors have) and do well despite poor conditions: Peaches, apples, raspberries (native black, cultivated red, cultivated yellow), blackberries (native), black currants, gooseberries, elderberries, concord grape, black walnut. Also strawberries (not a woody plant but still perennial berry) and rhubarb (not woody or even a fruit, technically). Also, probably not what you have in mind, but garden huckleberry (Solanium scabrum, the ones that look like nightshade) has the potential to be a self-seeding annual like tomatoes; I've had volunteers for a few years now (I only include them because I'm thinking along the lines of low-maintenance/ perennial fruit, in addition to trees/ bushes/ vines).
Poor producers: apricot*, blueberry, wild rose and climbing rose (I was hoping for a better showing of hips, even if they're not big producers like Rugosa).
Plants too young to produce, but looking healthy (most started from seed): jostaberry, cherry, paw paw, aronia, mulberry, goji, chestnut (not sure if Chinese, American, or a hybrid; the seeds came from an Amish farm 30ish miles north of me, purchased at a farmer's market), English walnut. Also, in theory I should be able to keep jujubes, but I killed my first round of seedlings; trying them again this year.
Things I can buy from local orchards/ berry farms within 15 miles of my house, or have seen healthy specimens of: pears (Bosc, Bartlett, Seckle, Asian types), apples (including crab apples), cherries (tart and sweet, black, red, and golden, so all kinds basically), peaches, nectarines, plums (Asian & European varieties), apricot, mulberry, redbud (we're not in its natural range but I've seen them in ornamental landscaping), hawthorn; elderberry, blueberry, currants, gooseberries, cranberries, shadbush/ serviceberry; grapes (not sure of the varieties, there are a few vineyards around), hardy kiwi/ kiwiberry, passionflower; chestnut, walnut (English and Black), hickory nut. Also, not necessarily food producers, but edible/ seasoning/ medicine producers: sumac, juniper, spicebush, linden.
*I think my tree is a dud, being 20 years old and producing a grand total of one fruit (which got eaten by bugs before maturing), but apricots are touchy all over the region--they bloom too early and there's nothing around to pollinate them some years, or a freeze kills the blossoms or very young fruit.