Small quantities of lavender and rosemary (they are most prolific in winter and early spring - the bees LOVE them)
White Alyssum (bees love this one too)
Peas & Beans
Zucchini, Squash and Pumpkins (great for bumblebees in particular)
Parsley, Dill and Silverbeet/chard - unshowy flowers, but very attractive to hoverflies, flower long horn beetles and other small beneficials.
Cucumbers, watermelons & melons
Cornflowers (pretty, edible, and so many colours!)
Pansies (also edible, pretty and wide in range)
Calendula (awesome for bees, ladybirds, edible, medicinal)
Marigolds - French and African (bees and ladybirds love them)
Dahlias (surprisingly easy to grow from seed, and you get a wide range of colours)
Basil, NZ spinach
Coreopsis (red amulet)
Dandelion and it's look alikes
and probably a few more I've forgotten!
The more variety available, the more attractive your garden will be to the pollinators and other beneficial insects, which do wonderful things for your garden.
Don't forget to provide them with water in the summer too - a shallow bowl filled with small stones and water will allow these small friends to land, drink, and safely depart.