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.
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.