Flot’s source code has been moved to Github from Google code in August 2012, so now they have official site www.flotcharts.org.
There are lots of plugins for Flot, for example, zoom and pan, you need plugins.
Flotr is the replacement of Plotr. Because Plotr is deprecated.
Official site: https://code.google.com/p/flotr/
Flotr2 is actually the updated version of Flotr. seems the team turned the major work on Flotr2 branch.
Flotr2 was trying to be a new Flotr without the dependency of Prototype JS framework. please read here for detail information.
4: Google Charts
Google Charts provides a perfect way to visualize data on your website.
But you know you need Google Chart libraries, it is big? we have no idea at present.
5: YUI Chart
YUI: Yahoo User Interface library.
YUI Charts is here. Yes, it needs external library too.
Another library which is built on HTML5 canvas. Easy, object oriented client side graphs for designers and developers.
Looks like they are still simple now. but who know the future.
We might continue to collect other related resource.