http://www.chartjs.org/ Simple yet flexible JavaScript charting for designers & developers
What you get - 8 Chart types (Visualize your data in 8 different ways; each of them animated and customisable.) - HTML5 Canvas (Great rendering performance across all modern browsers (IE9+).) - Responsive (Redraws charts on window resize for perfect scale granularity.)
Whats new - Mixed chart types (Mix and match bar and line charts to provide a clear visual distinction between datasets.) - New chart axis types (Plot complex, sparse datasets on date time, logarithmic or even entirely custom scales with ease.) - Animate everything! (Out of the box stunning transitions when changing data, updating colours and adding datasets.)