In the rear half of our property, we've planted a widely varied assortment of fruiting plants for wildlife forage, and in turn, the birds have brought in a few others. In summertime we collect mulberry fruit, wild raspberries and blackberries - none of which are cultivated.
We have a mature pair of green apple trees, likely a Granny Smith variety, that grow along the southern edge of the pasture fence. They're grown naturally, and usually produce heavily. The fruits aren't perfect, but they make great apple/pear pies and preserves. Last year's apple use adventures included making and canning apple butter; by slow-simmering untreated skins and cores, the parts you'd usually throw away. Yummy!
We trade apples for pears with a near neighbor, though we'd like to add a few pear trees here, eventually.
There's also a small cultivated plot of June-bearing and ever-bearing strawberries.
We had hardy peach trees for a several years, but they suffered borer damage and had to be removed.