Easy, Object Oriented Client Side JavaScript/HTML5 Charts & Graphs: Chart.js

Chart.js is a lightweight (4.5kb minified) JavaScript charting/graph library for creating object-oriented client side charts & graphs.

It has 6 chart types, offers numerous customization options and help visualize your data in different ways. Each of them animated, fully customisable and look great, even on retina displays.

Chart.js uses the HTML5 canvas element. It supports all modern browsers, and polyfills provide support for IE7/8.