AmCharts provides us three type of charts, Pie Charts, Line Charts and Bar/Column Charts. They are all animated and interactive Flash Charts. Users can pull out a slice of pie chart by clicking on it. Users can zoom in/out by highlighting a specific area of the line chart. The bar/column can be 100 stacked, mouseover to view more details. All Charts are free to download, the only limitation of free version is that a small link to AmCharts will be displayed in top left corner of your charts.

Requirements: Any Modern with Flash 8.0+
Demo: http://www.amcharts.com
License: License Free