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http://jquery.com/ - http://jquery.com/
A fast, concise, library that simplifies how to traverse HTML documents, handle events, perform animations, and add AJAX. |
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Prototype - http://www.prototypejs.org/
Provides class-style Object Oriented and AJAX, freely distributable under the terms of an MIT-style license. |
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http://dojotoolkit.org/ - http://dojotoolkit.org/
A Toolkit by the Dojo Foundation featuring DHTML and AJAX functions. The site features demos, downloads, help on getting started, documentation, support and community fundtions. |
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Open Rico - http://www.openrico.org/
Offers visual effects, styling, drag and drop and ajax functions. Requires Prototype. |
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MochiKit - http://www.mochikit.com/
Provides a suite of libraries taken from Python. Documentation and download. |