Sketch Mirror - Preview your iOS designs directly on your devices
Tales Untold - Smart stories for smart kids (and smart parents, too).
Flowkit - Sketch library for user flows/content maps/annotations
My Storytime - Tell stories, even when you’re apart with Google Assistant
Crystal: Sketch Mirror for Android - Crystal: Sketch Mirror for Android is an application that is designed for viewing your sketch designs in real-time, navigate prototypes and download content related to the sketches for offline viewing.
The WALLOBOOKS Project - A magical storybook anybody can write, every kid can read