• ECMAScript - Official website for ECMAScript. Learn about the ECMAScript language and discover the ECMAScript community.
• JavaScript - JavaScript at Wikipedia, the free encyclopedia
• Mozilla Developer Center - The premier JavaScript sites. It has lot of tutorials and references You will really want to use this one.
• JavaScript Technology - Your resource from Sun Microsystems for JavaScript editors, news, and blogs.
• Rhino: JavaScript for Java - Rhino is an open-source implementation of JavaScript written entirely in Java.

Top JavaScript Frameworks:

• Prototype - This holds the reference API documentation, replete with examples and crossreferences. You'll also find various tutorials and get to know Prototype Core members.
• script.aculo.us - A complete set of reference API documentation, Installation Scripts.
• DoJo - A complete set of reference API documentation, Installation Scripts.
• Ext JS - A complete set of reference API documentation, Installation Scripts.
• Rico - A complete set of reference API documentation, Installation Scripts.
• Qooxdoo - qooxdoo is a comprehensive and innovative Ajax application framework.