The Google Chart API lets you dynamically generate charts. It returns a PNG-format image in response to a URL.
Several types of image can be generated: line, bar, and pie charts for example. For each image type you can specify attributes such as size, colors, and labels.
You can include a Chart API image in a webpage by embedding a URL within an<img> tag. When the webpage is displayed in a browser the Chart API renders the image within the page.
Visit from here at Google chart API
License: Free
Actually I don't know what to comment on these topics,however its very good application in such a particular situation
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