CSS For Bar Graphs - good looking, only need pure XHTML and CSS only.
Webfx Charts - can create stacked area, line and bar.
CSSPlay Bar Charts - is compatible with major browsers.
CSS Line Graphs
Accessible Bar Chart
Dojo Charting Engine - let you create complex charts easily.
Plotr Charts - lightweight charting framework.
Terrill Vertical Bar Graphs - CSS and PHP techniques are required.
CSS Vertical Bar Graphs - typical vertical bar graph, right click to see the source code.
Dynamic Pie Chart with CSS - creating a semi-dynamic pie chart.
Khmerang Bar Graphs - awesome gold!
Chronoscope Interactive Chart - works at Firefox and Safari.
Dynamic Drive Pie Graph - simple pie graph, created by DynamicDrive.
Dynamic Drive Line Graph - simple line graph, also created by DynamicDrive.
Complex CSS Bar Graph - designed by ApplesToOranges.
Canvas Graph - similar with PlotKit Chart Plotting.
CSS Bar Graphs - basic bar graph.
Maxdesign Percentage Graph
Create A Graph Classic - simple online graph generator.
FooPlot - online graphing calculator and plotter.
Flowchart - free to create charts online.
CSS Bar Graphs and Charts
http://www.amcharts.com/ - free version will display a small link on charts.
Create cross browser vector graphics - by Dylan Schiemann @ ThinkVitamin.