ExtJS and Webix have been my prefered ways of building apps. Hoever, I have found some alternatives:
- http://w2ui.com/web/get-started – with Metro Blue theme from jeasyui would be fantastic.
- http://www.jeasyui.com/
And more here:
http://www.sitepoint.com/top-5-jquery-ui-alternatives/
or here:
https://www.google.ro/search?q=javascript+rich+ui+framework&ie=utf-8&oe=utf-8&gws_rd=cr&ei=B0FCVaTqFIXiUdH_gbAM