Brick – UI Components for Modern Web Apps
Interesting, although I think the "beta" is quite literal. Seems to lack a bit of polish.<p>The one I was most interested in was the Date Picker, but locks up Chrome (28) and Safari (6) on my machine.
<a href="http://mozilla.github.io/brick/component/datepicker/demo/index.html" rel="nofollow">http://mozilla.github.io/brick/component/datepicker/demo/ind...</a>