Tableau Public is a free data-visualization software that allows users to create visualizations in a simple, easy to use format. Users can also create a profile, save their works to it, and then share their works for their profile via social media.
TimelineJS
TimelineJS is an open-source tool to build visually rich, interactive timelines. It is free and produced by Knight Lab at Northwestern University.
StorylineJS
StorylineJS is an open-source tool to build an annotated, interactive line chart. It is free and produced by Knight Lab at Northwestern University