Date: 02/17/06 (Java Web)    Keywords: java, web, yahoo

Yahoo released an UI library for web applications, developed using Javascript and AJAX. It provides some nifty components like dual-calendar, tree, drag-and-drop, slidedrs etc. Very much worth adding to your toolkit. Personally I found the performance somewhat sluggish. DOJO is another alternative (better?). Link

Source: http://blog.taragana.com/index.php/archive/yahoo-ui-library-javascript-ajax-is-worth-looking/