Logos has I think several, free translations of the Quran (including Pickthal).
Would it be possible,(it might not be very hard for FL to do because I think a lot of it is probably not bound by copyright), to include complete Hadith collections, and Islamic commentaries from the middle ages into Logos? Also, I would say medieval Islamic histories. I don't know how easy that would be because those can be hard to find. I collected most of al-Tabari in pdf form from my old university Library years ago.