Plot Factory - Online story planner, organizer, and writing application.
Hullabalu - Interactive stories for kids
Scrivener - Scrivener is a content-generation tool for composing and structuring documents.
Night Zookeeper - Help children develop storytelling skills
World Anvil - World Anvil is a worldbuilding tool for Authors, Storytellers and worldbuilding lovers.
Tappity - Tappity teaches your child about science from experts.