infogr.am is a site similar to easel.ly and other tools for building inforgraphics, flow charts, and interactive data sets. While it does require a log-in, it is free to use and share. The site has lots of templates to choose from and some simple tutorials to help as the students learn.
Project-Based Learning: Infographics are a really wonderful way to display information, especially when it is data-driven. Hooray for data!