JavaScript InfoVis Toolkit
The JavaScript InfoVis Toolkit provides tools for creating Interactive Data Visualizations for the Web.
The JavaScript InfoVis Toolkit provides tools for creating Interactive Data Visualizations for the Web.
Compass DataGrid is an ajax-driven data grid that relies on server-side code for its data. Rather than manipulating an existing table or breaking it down into multiple pages, Compass DataGrid takes an empty table and populates it by connecting to a server-side url via ajax. As users interact with the grid, the grid talks with the server-side script letting it know what the user is requesting. The server-side script then provides JSON encoded data for the plugin to update the table.
Video JS is a javascript-based video player that uses the HTML5 video functionality built into advanced browsers. In general, the benefit of using an HTML5 player is a consistent look between browsers.
HumbleFinance is an HTML5 data visualization tool written as a demonstration of interactive graphing in HTML5. It is similar to the Flash tool on http://finance.google.com/. The tool itself is written entirely in JavaScript, using the Prototype and Flotr libraries. It can be used to display any two 2-D data sets of real numerical data which share an axis.
SproutCore is an HTML5 application framework for building responsive, desktop-caliber apps in any modern web browser, without plugins.
SproutCore works by doing the only thing that can truly eliminate the latency problem: it moves your business logic to the client. SproutCore applications are full-fledged programs, written in JavaScript. That JavaScript executes in your user’s browser, freeing up your servers (and server engineers) to focus on what’s most important in a cloud application: delivering users’ data as quickly and reliably as possible. But SproutCore isn’t your mama’s JavaScript library. It isn’t meant to augment existing web pages. It isn’t meant to add animation to documents. SproutCore is a tool for building applications. It has more in common with Cocoa or .NET than jQuery or MooTools. Because of that, SproutCore will change the way you think about building web apps. SproutCore is server-agnostic and will plug into your existing backend. http://www.sproutcore.com/
jsPlumb is a jQuery plugin for visually connecting HTML elements on a web page.
It uses a HTML5 canvas element when supported and Google's ExplorerCanvas script to support older browsers.
The styles, shapes of the wires and "the position of the connection" can be customized easily.

Grafico's basic principles are to provide good, clean looking graphs inspired by work of Stephen Few and Edward Tufte, while still being flexible to implement and providing numerous api options to tweak the look of the graphs..
Some key things Grafico has:

List of 28 Rich Data Visualization Tools
http://www.insideria.com/2009/12/28-rich-data-visualization-too.html