Google Charts - Interactive charts for browsers and mobile devices.
Charts Factory - Create simple charts super fast and for free!
ZingChart - ZingChart is a fast, modern, powerful JavaScript charting library for building animated, interactive charts and graphs. Bring on the big data!
FnordMetric - Create charts and dashboards from SQL
Highcharts - A charting library written in pure JavaScript, offering an easy way of adding interactive charts to your web site or web application
Mountain - Living seamlessly in the menu bar Mountain allows you to manage volumes with ease.