• jChartFX - a set of Javascript libraries providing the most complete collection of charts and graphs for professional and serious business data visualization and analysis
• Chart.js - Easy, object oriented client side graphs for designers and developers

http://moblur.org/workshop/jflot_intro/

用 jQuery 和 Javascript 在使用者端描繪出流量圖。

http://pchart.sourceforge.net/

a PHP class to build charts