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For iPad look at Marvin. By far the best I've seen on that platform.
For Android I recommend using Calibre Companion for organization (you'll need to manage your books on your computer with Calibre to benefit) and Moon+ Pro or Mantano for readers (Mantano has pretty good organization without Calibre Companion I just prefer CC).
Know nothing about the Windows RT platform except I've heard Freda mentioned a time or two.
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