MooTools : It is one of the popular JavaScript toolkits which is primarily used for creating visual effects.
Google Web Toolkit (GWT) : It enables developers to create rich Ajax applications using Java.
Dojo Toolkit : It is most popular toolkit and used in large number of applications. It is a modular JavaScript toolkit which is distributed under an open-source license. Dojo toolkit includes many user interface effects, widget APIs, drag and drop AISs etc.
Yahoo User Interface(YUI) : YUI library is an open source JavaScript framework and is used to make interactive applications.
Spry : This framework was developed by Adobe. It consists of animation and visual effects components, a data binding component, and a framework to crate widgets.
