Google Charts - Interactive charts for browsers and mobile devices.
JavaScript.com - A free resource for learning and developing in JavaScript
ZingChart - ZingChart is a fast, modern, powerful JavaScript charting library for building animated, interactive charts and graphs. Bring on the big data!
Learn JavaScript - Learn JavaScript with guided tests and flashcards
Highcharts - A charting library written in pure JavaScript, offering an easy way of adding interactive charts to your web site or web application
The Ultimate SaaS Quiz - Challenge your friends and improve your SaaS knowledge