Timeline JS is a free timeline tool that can be poplulated from either a Google spreadsheet or a JSON file, and can draw media material from a variety of sources, such as Twitter, Flickr, Wikipedia, YouTube and more. It has been designed to be both easy to use and easy to embed the results in another web page.
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Timeline JS also appears in Project Bamboo's DiRT, a registry of digital tools suitable for academic research. DiRT contains a wide range of tools and software searchable by task, such as annotation, content management, collaborative research, or authoring. It is an excellent resource for Digital Humanists seeking the right tool for the task at hand.
View Timeline JS in DiRT:
http://dirt.projectbamboo.org/resources/timeline-js
View the full site:
http://dirt.projectbamboo.org/