YUI Library

YUI Compressor

YUI Javascript Documentation Tool

YUI 2.x Source Tree

A library for building richly interactive web applications.

YUITest wrapper for PhantomJS

YUI Test

Command Line Helper for YUI

YUI3 Gallery Modules

New YUI build tool based on Gearjs, so let's shift some gears

Default JSlint rules used by YUI in it's various packages

A tool for creating skins for YUI widgets

Repository for the 2in3 project source

Yeti automates browser testing.

YUI Build Tasks

Server side PHP loader for YUI files

yui.github.com

YUI module stealer/packager

SWF-based functionality for https://github.com/yui/yui3.

A native Windows 8 App that runs YUI unit tests.