Simple HTML5 Charts using the canvas element chartjs.org
The guys at ChallengePost are running a competition to design and build a personal dashboard using Chart.js, and are offering some great prizes for winning. Take a look at chartjs.challengepost.com.
You can find documentation at chartjs.org/docs.
Chart.js was taken down on the 19th March. It is now back online for good and IS available under MIT license.
Chart.js is available under the [MIT license] (http://opensource.org/licenses/MIT).