DHTMLX Ajax Toolkit - professional DHTML components for advanced Web user interface: tree, grid, treegrid, menu, tabbar, combo, windows, file uploader, etc.
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.
The YUI Library provides tools for professional web development, including a rich JavaScript and CSS library -- all freely available under a liberal BSD license.
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.
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