Scrivener - Scrivener is a content-generation tool for composing and structuring documents.
Plot Factory - Online story planner, organizer, and writing application.
Aeon Timeline - "The timeline tool for creative thinking. Capture, create and explore ideas."
World Anvil - World Anvil is a worldbuilding tool for Authors, Storytellers and worldbuilding lovers.
Novlr - Online word processor and organizer for novel writing.
ApolloPad - Great online app for writers, novelists, and bloggers.