Ageratum, alyssum, aquilegia, begonia, (bedding), calendula, cineraria, coleus, cyclamen, Canterbury bells, forget-me-not, foxglove, impatiens, linaria, lobelia, mimulus, nasturtium, nigella, pansy, polyanthus, primula, schizanthus, viola, Virginian stock, wallflower. (Viola and pansy require at least half sunlight.)
Don't forget that you can cheat and add a little bit of colour to those shaded parts of the garden by hanging streamers or bunting from trees, setting up mirrors to reflect what light is there, or using coloured pots. Let your imagination take you on a journey to brighten up your shady garden.
This information is from the Yates Garden Guide: fully revised & updated 44th edition, HarperCollins, $39.99. You can have this information and so much more at your fingertips by purchasing the Yates Garden Guide, available at all leading bookstores and Bunnings stores.