basil, alyssum, cuphea, sage, thyme, beets, spinach, lettuce chives, carrots, chard, cilantro. Tomatoes, peppers and eggplant are in the same family so they can be grown together if you have the room. You can alternate rows of corn with rows of peppers.
Tall corn can provide shade for plants that don't like extreme heat and so you can create a microclimate to extend their season a little longer.
Rainbow chard and bulls blood beets have colorful foliage so you can get edible color too.
marigolds, sunflowers, borage, calendula, greek oregano,cilantro, queen Anne's lace (gets tall)
Plant fennel somewhere in a corner in the yard. It does not like company but it will act as a trap plant and when it blooms it attracts a lot of beneficial insects. Aphids will swarm the fennel, but if it is healthy it won't be affected. Ladybugs will lay their eggs on the fennel and the ladybug larvae (ugly purple and orange things only a ladybug would love) will voraciously feed on the aphids.