jQuery, Charting

http://jquery.com/
flot - Javascript plotting for jQuery : draws on the canvas element (For IE version earlier than 9, needs excanvas JavaScript emulation helper and canvas-text). Purposes are easy use, attractive look, and interactive features.
Google charts - This is actually closed source. The JavaScript is compacted, and loads libraries dynamically at runtime.

用于图片处理的10个超级jQuery插件
Comparison: Javascript框架和jQuery