Yahoo! UI Library (YUI)

Yahoo! UI Library (YUI) an BSD licensed JavaScript UI library released by Yahoo!.

I play with it for a while, at the first glance, it looks like a Dojo Toolkit. But unlike the Dojo, all the functions are very well documented with JSDoc. For all the sub-modules, full/debug/min versions are provided for purposes. But it only provides a subset features of Dojo. :)

So YUI is:
  • Well documented;
  • Well organized object hierarchy;
  • Less features