Flotr2 is an open source library for HTML5 canvas charts and graphs which is a fork of the popular flotr without the dependency of Prototype JS framework and has many improvements.

The library is framework independent and has support for line, bar, candle, pie and bubble charts.

There are lots of customization options offered like the ability to define titles, subtitles, colors, labels on/off and so many others for each and every possible variable.

Flotr2 outputs are interactive, they can be set to respond to the actions of the user. And, they can be extended with plugins (there are already several ones that can add interactions, new decorations, etc.).

Charts and graphs work in all major browsers (including IE6) and they are mobile compatible.

Rickshaw is a JavaScript toolkit, created by the developers of the stock photo service Shutterstock, for generating interactive and real-time graphs.

It is built on top of the D3.js visualization library and can render stack or line graphs.

The graphs are interactive, respond to hovering them or their legends, items in the stack can be re-ordered with drag 'n' drops and more.

There is a good margin for customization: colors, sizes, interpolation and functionality in general with the modular/extendable structure of the toolkit.

Visifire, a professional set of charting tools that works on WPF, Silverlight & Windows Phone 7, is giving away 5 "Single Developer Licenses with Premium Support" (worth $499 each) to WebResourcesDepot readers.

Please check the details of joining this giveaway at the bottom of this post and here are more details about this exciting resource.

What is Visifire?

It is a multi-targetted kit of data visualization controls which is compatible with WPF, Silverlight & Windows Phone 7 which uses the same API for developing in all these platforms.

Visifire is not dependent on any server-side technology and can be used with almost any language including ASP, ASP.Net, SharePoint, PHP, JSP, ColdFusion, Python, Ruby or just simple HTML.

It has support for many chart types like bar, column, line, are, pie, stock, radar, stack, doughnut and more. Circular and linear gauges can be created too.

All the visualizations are very good-looking, interactive (responds to mouse-overs and clicks) and have shiny animations.

It is possible to zoom into charts by selecting a part of it to view only the selected portion.

They can be styled/themed easily and edited with Microsoft Expression Blend.

How to join the giveaway?

In order to win one of the licenses given away:

• Share this giveaway with a tweet: "Just joined the @Visifire – Windows Phone Charting Tools giveaway at WebResourcesDepot – http://goo.gl/igJKg" (click to tweet easily)
• Follow @visifire Twitter user
• Share your tweet URL within the comments

SELECT * FROM wp_comments WHERE comment_post_id=2494 AND comment_approved=1 AND comment_type='' GROUP BY comment_author_email ORDER BY RAND() LIMIT 5

The winners will be selected with the query below on 6 October 2011 (1 week later) and good luck everyone.

Elycharts is an easy-to-use and customizable library for creating charts with only JavaScript.

The library supports most of the popular chart types including line, column, are, bar, pie, sparklines and combinations.

Elycharts comes with many interactions like mouse tracking and events, highlight of selected areas with various animations, tooltip and hints, html anchors and many more.

Also, it can modify data dynamically with good-looking animations to display the change in charts.

The charts are generated with SVG/VML and the library is built on jQuery + Raphaël.

JointJS is a cross-browser JavaScript library for creating fully interactive diagrams.

It makes use of Raphaël.js, can connect vector objects with different types of arrowsand interact with connections + objects.

The library is plugin-based for extending easily and there are ready-to-use plugins for popular diagrams (ERD, Org chart, FSA, UML, PN, DEVS, LDM).

Objects can be drag 'n' dropped by still keeping the hierarchy created and there are callback functions provided on every level.

Heatmaps, which we usually see in analytics apps, are a great way of visualizing density.

ClickHeat (WRD article), a PHP class, is probably the most popular open source resource for creating them. Another alternative is Heatmap.js which eases creating them with only JavaScript.

This JavaScript library uses HTML5 canvas for generating the visualization with the data provided.

It can be customized completely including the color gradient, opacity, datapoint radius and much more.

Heatmap.js is a fresh resource, the documentation is inside the code and various examples are provided to get you started.

Peity is a jQuery plugin for creating word-sized charts (sparklines) using HTML5 <canvas>.

It has support for bar, line and pie charts where color, width, radius and delimeter can be updated.

The plugin adds a "change" event trigger to the graph elements, so, once their data is updated, the charts can be regenerated instantly.

If you would like to add new chart types, Peity can be extended by adding the new charting functions easily.

D3 is a lightweight and free JavaScript library for manipulating HTML documents based on data.

It can help us visualizing the data as HTML or SVG quickly, handle interactivity, and incorporate smooth transitions + staged animations into web pages.

The library can be used as a visualization framework (like Protovis) or as a framework to build pages (like jQuery).

D3 is not the traditional visualization framework that comes with it limits and ready-to-use templates. Rather, it solves only the crux of the problem: efficient manipulation of documents based on data which ends up in a serious flexibility.

AwesomeChartJS is an open source JavaScript library for creating charts using the HTML5 <canvas> tag.

The library is standalone (doesn't require any JS frameworks) and works very straightforward with an easy-to-use function.

It supports multiple chart types:

• vertical and horizontal bar charts
• pareto bar charts
• pie charts (whole or part)
• exploded pie charts
• ring/doughnut charts

It focuses on simplicity and doesn't offer too much for customization other than the title, chart type and labels. Yet, simplicity is sometimes all we ask for.

Arbor.js is a graph visualization library built with web workers and jQuery.

It provides an efficient, force-directed layout algorithm, abstractions for graph organization and screen refresh handling.

The library doesn't force a specific method for screen-drawing and you can use it with canvas, SVG, or even positioned HTML elements; the best one that fits your project.

Arbor.js simply helps you focus on the graph data and its style rather than spending time on the physics math that makes the layouts possible.

It also comes with a well-documented API and creative demos.