Plants for shade part three. "When in doubt, plant a geranium" said the gardener and writer Margery Fish. There is a hardy geranium that will suit just about any aspect and that includes shade. For example Geranium phaeum will clump up and flower in sun, part shade or full shade. 

 Several other species like the low growing ground covering Geranium macorrhizum are similarly versatile. Indeed this seems to be a plant family with good tolerance generally to at least partial shade. I should also mention the humble weed/wildflower Herb Robert (Geranium robertianum) which seeds itself very readily all over the place.