More shade loving plants:

bacopa hybrid
begonia
browallia
coleus
mimulus
pansy viola tricolor
viola tricolor

Note that the pansy and viola will self seed and you'll have them coming up year after year, even though they are annuals. I personally love the violas, just like pansy's but smaller, their cute flower faces are so tiny, colorful and beautiful.

And NONE of these are groundcovers.