Best JavaScript Frameworks/Libraries:

1.) JQuery

2.) YUI

3.) Dojo

4.) ExtJS

5.) Prototype

6.) MooTools

7.) script.aculo.us

8.) AngularJS

9.) Backbone.js

10.)Ember.js

References:

http://www.w3schools.com/js/js_libraries.asp

http://en.wikipedia.org/wiki/Comparison_of_JavaScript_frameworks

http://readwrite.com/2014/02/06/angular-backbone-ember-best-javascript-framework-for-you

http://www.infoq.com/research/top-javascript-mvc-frameworks

http://jonathanmh.com/best-javascript-mvc-frameworks-2013-2014/

http://www.infoworld.com/d/application-development/the-10-hottest-javascript-framework-projects-228335

http://designzum.com/2014/02/19/top-best-javascript-framework-2014/

http://code.tutsplus.com/articles/20-javascript-frameworks-worth-checking-out–net-22020