You can use the Google Charts API in order to generate various charts from other modules.
Unpack in your modules folder (usually /sites/all/modules/) and enable under Administer > Site Building > Modules.
Key features "Chart API":
· Lightweight, reliable, no need for server side libraries or additional modules
· Simple to extend and implement within the Drupal framework
· Memory friendly
· 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Download periodically updates information of Chart API script from the developer, but some information may be slightly out-of-date.
Our script download links are directly from our mirrors or publisher's website. Chart API torrent files or shared files from free file sharing and free upload services, including Rapidshare, MegaUpload, YouSendIt, MailBigFile, DropSend, HellShare, HotFile, FileServe, MediaMax, zUpload, MyOtherDrive, SendSpace, DepositFiles, Letitbit, LeapFile, DivShare or MediaFire, are not allowed!