World Anvil - World Anvil is a worldbuilding tool for Authors, Storytellers and worldbuilding lovers.
Kanka.io - Kanka.
Plot Factory - Online story planner, organizer, and writing application.
Notebook.ai - A smart notebook that grows and collaborates with you
Character Story Planner - Character Story Planner is an efficient mobile app introduced by Ifantasia that helps you to write books and create story characters conveniently.
Plottr - Visually plot out your novel 📚✍️