Create rapidly Beautiful User Interfaces

Dojo's Dijit and DojoX provides a complete collection of user interface controls, giving you the power to create web applications that are highly optimized for usability, performance, internationalization, accessibility, but above all deliver an incredible user experience. Completely free and open-source with no strings attached or licenses to buy!
Dijit is suitable for just about everything, including:

• Simple web sites and blogs that just want to unobtrusively add some simple widgets or interactivity, such as a Flickr Image viewer or a Twitter feed summary
• Robust web applications such as email communication suites, mapping engines, and e-commerce solutions
• Enterprise intranet apps to replace legacy thick client desktop software for internal and external sales reports, document management systems, and other productivity software to manage and visualize data entry and retrieval
• Embedded and mobile applications : 

by TAATJENE