Over at Smashing Magazine they have put together a very good list of 40 useful JavaScript libraries.
Below is an excerpt from the list.
3. Visualization And Image Effects
JS charts
JS charts supports bar charts, pie charts and simple line graphs. It offers nice usability by simply inserting the library onto Web pages and calling the data from an XML file or a JavaScript array. Charts are created as PNG files and the library is compatible with all the major browsers.Canvas 3D JS Library (C3DL)
C3DL makes writing 3D applications easy. It provides a set of math, scene and 3D object classes to make the canvas more accessible to developers who want to develop 3D content in a browser but not have to deal in depth with the 3D math needed to make it work.Processing.js
This is a JavaScript port to the Processing language (a language for programming images, animation and interactions). The library is feature-rich for creating 2D outputs. It provides methods for shape/image drawing, color manipulation, fonts, objects, math functions and more.Raphaël
An amazing library that simplifies working with vector graphics on the Web. Raphaël uses SVG and VML for creating graphics that can be modified and event handlers that can be attached to them. The library is feature-rich in functions, including rotation, animation, scaling and drawing curves, rectangles and circles.ImageFX
This is a JavaScript library for adding effects to images, like blur, sharpen, emboss, lighten and more. ImageFX uses canvas element for creating the effects. It is compatible with all major browsers (there is a compatibility chart on the script’s page). The library is so easy to use. Simply inserting the .js file in the Web page and calling a one-line function is enough.Pixastic
Pixastic uses the HTML5 canvas element, which enables accessing raw pixel data. The effects supported include desaturation and grayscale, inverting, flipping, brightness and contrast adjustment, hue and saturation, embossing, blurring and much more. Because the canvas element is relatively new, the library does not have equal support in all browsers yet.Reflection.js
An unobtrusive JavaScript to auto-create reflection effects. The height and opacity of the reflection can be defined. Using it is as easy as adding a “class” to the images. It works in all major browsers and is smaller than 5 KB.
You can read the full post here.
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