Develop Rich interactive internet applications with these javascript drawing and canvas libraries. JavaScript developers, web developers and webmasters can take advantage of these libraries to add graphics drawing functionality to their web applications or websites.
Continue reading about 10 Best Javascript Drawing and Canvas Libraries
Flotr is a javascript plotting library based on the Prototype Javascript Framework version 1.6.0.2 at the moment and inspired by Flot written by Ole Laursen. 
Canviz is a JavaScript library for drawing Graphviz graphs to a web browser canvas. More technically, Canviz is a JavaScript xdot renderer. It works in most modern browsers.
In this article, I want to explain and deduce the line drawing algorithm by Bresenham. Afterwards, I will show an optimized version which can be used to draw lines in Gecko based browsers like Mozilla or Firefox and Microsoft Internet Explorer. As you know, HTML itself is not able to describe lines. Therefore, there is no built-in features in the above-mentioned browsers for drawing lines. By implementing the Bresenham algorithm with JavaScript while applying some tricks, we will be able to draw lines in a good manner in respect to the browser runtime and memory footprints.
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Raphael is a very slick looking JavaScript library for drawing and animating vector graphics with JavaScript. The API is simple and well thought-out and it supports all major browsers, including Internet Explorer 6.
PlotKit is a Chart and Graph Plotting Library for Javascript. It has support for HTML Canvas and also SVG via Adobe SVG Viewer and native browser support.
Canvas Graph is a small simple javascript library that allows you to conveniently plot simple line, bar and pie charts using the new HTML Canvas Tag.
Continue reading about CanvasGraph.js : Graphing in Javascript
This is a pure JavaScript library to draw 2D graphics on web pages inside web browser without using SVG or VML. JavaScript developers, web developers and webmasters can take advantage of the library to add graphics drawing functionality to their web applications or websites using the library. The library is entirely written in JavaScript and does not need any plug-in or additional software to run/execute. The JavaScript source code of the library is open and free under a LGPL License.
Continue reading about jsDraw2D : 2D Graphics Library for JavaScript
How many times you wished if you could only draw an arrow on your web page? Or few lines here and there? Unfortunately, HTML offers nothing in this department, and using images takes bandwidth and slows down the loading of your pages
Draw2D is the graph component of the Open-jACOB web based workflow editor. The purpose of this experiment is to see if a Visio-type workflow editor tool could be developed in a web browser. It demonstrates that it can be done.