* [[https://developers.google.com/chart/|Google Chart Tools]]
  * [[http://code.google.com/apis/ajax/playground/|Playground]]
  * [[https://developers.google.com/chart/interactive/docs/examples|Examples]]
  * [[https://developers.google.com/chart/interactive/docs/reference?hl=de-DE|Google Visualization API Reference]]
  * [[https://developers.google.com/chart/interactive/docs/gallery/intensitymap|Intensity Map]]
    * [[https://developers.google.com/chart/image/docs/gallery/map_charts|Map Charts]]