This is an interesting take on eBooks for pre-school children. Though not free, the app includes audio books, games, and the ability to send a custom report on the students' progress.
Touted as "the simplest way to make your own interactive eBook" this free program works on both Windows and Mac computers and is a great alternative to Apple's newly released iBooks Author.
The LitCharts Library provides chapter summaries to some of the most frequently read books in high school English curricula. It also features an iPhone App for reading. Teachers should be aware of this site as it bills itself as "the faster, downloadable alternative to SparkNotes."
I'm not quite sure how this works yet, but you can somehow use this when combined with Creative Book Builder to make something else...I need to play more for it to make sense.
Fantastic video from Luis Perez about adding alt tag descriptions to images in Book Creator. Between that, audio narration, text, and video, Book Creator may be the ultimate app for reaching all learners.