Highcharts - A charting library written in pure JavaScript, offering an easy way of adding interactive charts to your web site or web application
Charts Factory - Create simple charts super fast and for free!
Google Charts - Interactive charts for browsers and mobile devices.
ZoomCharts - Creating meaningful and aesthetically pleasing data visualizations and incorporating them into your projects is easy with the tools offered by ZoomCharts.
ZingChart - ZingChart is a fast, modern, powerful JavaScript charting library for building animated, interactive charts and graphs. Bring on the big data!
FusionCharts - JavaScript charts for web and mobile apps.