Top JavaScript Frameworks...

Following are the popular javascript frameworks:

DOM (manipulation) related

• Dojo Toolkit 
• jQuery
• MooTools
• Prototype JavaScript Framework
• YUI Library

GUI-related

• DHTMLX
• Ext JS
• jQuery UI
• Lively Kernel
• Kendo UI
• CreateJS
• Shield UI

 Graphical/Visualization

• D3.js
• CanvasJS HTML5 Charts
• JavaScript InfoVis Toolkit
• Kinetic.js
• Processing.js
• Raphaël
• Three.js
• Frame-Engine

Web-application related (MCV, MVVM etc)

• AngularJS
• Backbone.js
• Batman.js
• Cappuccino
• Google Web Toolkit
• JavaScriptMVC
• Knockout

 Pure Javascript/AJAX

• FuncJS
• Google Closure Library
• jsPHP
• Microsoft's Ajax library
• MochiKit
• PDF.js
• Underscore.js
• Wakanda Framework

Template Systems

• Handlebars
• jQuery Mobile
• Mustache
• Twitter Bootstrap