ExtJS - Javascript Library

Ext JS is a javascript library for developing interactive web applications using AJAX, DHTML, etc.

Documentation for Ext JS is available here.

Using ExtJS, we can easily develop interactive web applications.
For ex: To develop a grid with paging we need to write lot of code and handle paging events. But using ExtJS, we can achieve this by writing only few lines of code in javascript. We can avoid .Net grid controls and CSS.

We can use web service and JSON to pass the data to the javascript methods to display it in the grid. It has most of the features like inline editing, paging, sorting, etc.

You can find few samples and demos here.