Impatiens are a good choice for an annual, although I never found any scent to them myself, but they love shade and fill out quite nicely.

Vinca Minor (periwinkle) is a nice ivy like plant with purple flowers that likes shade and it's a perinnial.

I've never had much luck, but Bleeding Heart is supposed to like shade.

Hosta likes shade, but the flowers are insignificant and don't have a scent.

I have had daylilies grow on the north side of my house which is also under a huge shade tree all day.

Either way good luck with your plants this spring.