Timeline JS - Beautifully crafted timelines based on Google Spreadsheets that are easy, and intuitive to use.
Asana - Asana project management is an effort to re-imagine how we work together, through modern productivity software. Fast and versatile, Asana helps individuals and groups get more done.
Tiki-Toki - Tiki-Toki is web-based timeline software for creating beautiful interactive timelines that you can share on the web.
Trello - Infinitely flexible. Incredibly easy to use. Great mobile apps. It's free. Trello keeps track of everything, from the big picture to the minute details.
Aeon Timeline - "The timeline tool for creative thinking. Capture, create and explore ideas."
Basecamp - A simple and elegant project management system.