Plot Factory - Online story planner, organizer, and writing application.

Aeon Timeline - "The timeline tool for creative thinking. Capture, create and explore ideas."

Scrivener - Scrivener is a content-generation tool for composing and structuring documents.

Preceden - Preceden makes it easy to build simple, powerful timelines

World Anvil - World Anvil is a worldbuilding tool for Authors, Storytellers and worldbuilding lovers.

Timeline - Timeline is a cross-platform application for displaying and navigating events on a timeline.