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The Google Chart API Lets You Dynamically Generate Free Charts In Your Website
The Google Chart API 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. And best of all its absolutely free!
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.
Types of charts are Line chart, Bar chart, Pie chart, Venn diagram, Scatter plot. For more details and how to use the Google Chart API, check out the developer’s guide of Google Chart API.
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google chart is great for its simplicity. There is also chart.inetsoft.com that offers free visualization charts.