StoryMill - Developers and publishers of Mac, Win, and iOS productivity, home and office and writing software such as MacGourmet, Paperless and many more. Based in MN.
Aeon Timeline - "The timeline tool for creative thinking. Capture, create and explore ideas."
BlankPage - Stay motivated to write, and finish your story
Preceden - Preceden makes it easy to build simple, powerful timelines
Manuskript - Open-source tool for writers.
ChronoFlo Timeline Maker - Create beautiful interactive timelines that you can share online