Modernizr is a JavaScript toolkit that allows you to use cool new CSS3 and HTML5 features while maintaining a fine level of control over browsers that don't support them yet.
Dojo saves you time, delivers powerful performance, and scales with your development process. It’s the toolkit experienced developers turn to for building superior desktop and mobile web experiences.
qooxdoo is an advanced open-source JavaScript-based GUI framework. It helps you to implement AJAX-enhanced web 2.0 applications - easier than ever before.
The YUI Library provides tools for professional web development, including a rich JavaScript and CSS library -- all freely available under a liberal BSD license.
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