Mule, not sure these are 'heirloom', bit we have seeds that have been grown here for over a hundred years. I don't fool with the heirloom tomatoes, or others, but we do buy older types. Corn we grow 'mule' corn and silver princess, we also grow a variety of field pea known as red ripper, but it is about twice the size of the ones you can buy today from the store.
Tomatoes we grow the better boy, german pink, and pink girl. Most of these will revert after a season to 'cherry' type. The only 'heirloom' style tomato I ever grew was the Rutgers variety, but I didn't try to save the seed.
Sieva pole beans, clemson okra, ambrosia cantaloupe(hybrid), zipper peas, and top crop peas. This is in the garden.
On the farm, I'm planting both field corn and merit sweet corn, oats, barley, field peas. Mostly for feed conversion for animal stock.