Hullabalu - Interactive stories for kids
Plot Factory - Online story planner, organizer, and writing application.
Night Zookeeper - Help children develop storytelling skills
Scrivener - Scrivener is a content-generation tool for composing and structuring documents.
Hellosaurus - Interactive mobile shows kids can play, not just watch
World Anvil - World Anvil is a worldbuilding tool for Authors, Storytellers and worldbuilding lovers.