Aeon Timeline - "The timeline tool for creative thinking. Capture, create and explore ideas."
Plottr - The #1 rated visual book planning and series bible software for professional and aspiring writers.
Preceden - Preceden makes it easy to build simple, powerful timelines
Plot Factory - Online story planner, organizer, and writing application.
ChronoFlo Timeline Maker - Create beautiful interactive timelines that you can share online
World Anvil - World Anvil is a worldbuilding tool for Authors, Storytellers and worldbuilding lovers.