Here is a list of book making apps, used especially to create books and stories.
Paid iPad app: http://itunes.apple.com/us/app/my-story-book-maker-for-kids/id449232368?mt=8&uo=4&at=10l6SU
Paid iPad app: https://itunes.apple.com/us/app/book-creator-for-ipad-create/id442378070?mt=8&at=10l6SU
Free iPad app: https://itunes.apple.com/us/app/book-creator-free-make-books/id661166101?mt=8&at=10l6SU
Google Chrome app: https://app.bookcreator.com/sign-in
Website: https://bookcreator.com/
Free Windows program: https://app.bookcreator.com/sign-in
Free Mac program: https://app.bookcreator.com/sign-in
Free iPhone app: http://itunes.apple.com/us/app/storykit/id329374595?mt=8&uo=4&at=10l6SU
Paid iPad app: http://itunes.apple.com/us/app/little-bird-tales-easy-digital/id517996494?ls=1&mt=8&uo=4&at=10l6SU
Paid iPhone app: http://itunes.apple.com/us/app/little-bird-tales-easy-digital/id517996494?ls=1&mt=8&uo=4&at=10l6SU
Website: http://www.littlebirdtales.com/
Free iPad app: http://itunes.apple.com/us/app/puppet-pals-hd/id342076546?mt=8&uo=4&at=10l6SU
Website: http://generator.acmi.net.au/storyboard/
Free iPhone app: https://itunes.apple.com/us/app/sock-puppets/id394504903?mt=8&uo=4&at=10l6SU
Free iPad app: https://itunes.apple.com/us/app/sock-puppets/id394504903?mt=8&uo=4&at=10l6SU
Free iPhone app: https://itunes.apple.com/us/app/yakit-kids/id794546203?mt=8&uo=4&at=10l6SU