JQuery (or just Javascript) Widget Sets?

What do you use for JQuery widgets?  Or just plain Javascript.

Things like sliders, spinners, progress bars, etc.  I've used JQueryUI and it's worked great - just wondering what other (free) options there are there.

There are numerous commercial packages of course.

You named the best.

I used following libs in the past:

• http://jquerytools.org/
  
• http://www.jeasyui.com