Literature Apps?

I recently used Faber and Faber's iPad app for T.S. Eliot's "The Wasteland" in my introductory Humanities course. I plan to use their app for Shakespeare's sonnets in the future and I would love to find similar ones. Does anyone know of other literature or art history apps? I would also be curious to know more about how you've taught with these in the classroom. Thanks! All best, Sheila