Chart and Graph Plotting Library
It has support for HTML Canvas and also SVG via Adobe SVG Viewer and native browser support. PlotKit is fully documented and there is a quick tutorial to get you started. PlotKit is a complete rewrite of CanvasGraph. It is better structured and supported.
canvas in Internet Explorer. Both these scripts are supplied with the Bluff download. Bluff itself is around 11kB gzipped.
Use this script to create horizontal / vertical bar graphs, progress bars and faders. You can create simple graphs and even grouped bar graphs with legends, add labels, change colors etc. No graphics or graphical libraries required.
This is a purely DHTML/ CSS based Pie Graph script. It loads fast and blends in with the rest of the page. You can also use a transparent image for background.