You can use the Google Charts API in order to generate various charts from other modules.
Installation
Unpack in your modules folder (usually /sites/all/modules/) and enable under Administer > Site Building > Modules.
Key features "Chart API":
· Free
· Lightweight, reliable, no need for server side libraries or additional modules
· Simple to extend and implement within the Drupal framework
· Memory friendly
Requirements:
· Drupal 5.x/6.x
Top 4 Download periodically updates information of Chart API script from the developer, but some information may be slightly out-of-date.
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