Drawing on inspiration from Plotr and PlotKit, software developer Ole Laursen wanted to bring the same plotting functionality to jQuery. So he built his own jQuery plugin and called it Flot. While a bit oddly named, the first release of Flot, v0.1, already provides some impressive capabilities:
The project actually got started because we were growing dissatisfied with Plotr which looks nice but is pretty dumb when it comes to auto-detecting stuff and didn't have any interactive features which we needed for a custom web-based business intelligence application.
Demos of the Flot plugin can be found at Ole's site. The code for the plugin is hosted via Google Code.