jQuery UI is described as 'Open source library of interface components — interactions, full-featured widgets, and animation effects — based on the stellar jQuery javascript library . Each component is built according to jQuery's event-driven architecture (find something, manipulate' and is an website in the development category. There are more than 25 alternatives to jQuery UI, not only websites but also apps for a variety of platforms, including Windows, Mac, Linux and Self-Hosted apps. The best jQuery UI alternative is React, which is both free and Open Source. Other great sites and apps similar to jQuery UI are UIkit, Purecss, Fresh Web Framework and Ext JS.