Many would initially think that Javascript has something to do with Sun Microsystem’s Java but as the matter of fact, it doesn’t. Javascript was created by Netscape, they previous name was LiveWire, then LiveScript.

Javascript is a programming language that is normally used on the client side. It is easy to learn and pick up. Most Javascripts on websites serve the purpose of encouraging user experience, increase interactivity, functionality as well as web speed. DHTML (Dynamic HyperText Markup Language) is formed with the use of Javascript and CSS (Cascading Style Sheets). On the other hand AJAX (Asynchronous JavaScript and XML) is Javascript based web development technique that uses data formatted in XML.

Here are some good Javascript sites that worth a visit.

Javascript Framework

Prototype
Prototype is a JavaScript Framework that aims to ease development of dynamic web applications.

Yahoo! User Interface Library (YUI)
The Yahoo! User Interface (YUI) Library is a set of utilities and controls, written in JavaScript, for building richly interactive web applications using techniques such as DOM scripting, DHTML and AJAX.

Rico
Javascript framework designed for building rich Internet applications.

qooxdoo
qooxdoo is one of the most comprehensive and innovative Open Source multipurpose AJAX frameworks, dual-licensed under LGPL/EPL. It includes support for professional JavaScript development, a state-of-the-art GUI toolkit and high-level client-server communication.

Ext Javascript Library
Ext is a client-side, JavaScript framework for building web applications.

MooTools
MooTools is a compact, modular, Object-Oriented JavaScript framework designed for the intermediate to advanced JavaScript developer.

Dojo
Dojo is an Open Source DHTML toolkit written in JavaScript. It builds on several contributed code bases (nWidgets, Burstlib, f(m)), which is why we refer to it sometimes as a “unified” toolkit.

Scripts and Tutorials

AjaxLine

Ajax Rain

Ajaxlines
Ajaxlines is a project focused on providing its audience with a database of most of Ajax related articles, resources, tutorials and services from around the world.

Dynamic Drive
Dynamic Drive offers free DHTML, Javascripts and updates their archives frequently.

Free Javascripts
free-javascripts is a database listeings of free basic javascripts that help your website gets more interactivity.

HTML Goodies

Javascript.com

Javascript Kit
Tones of free Javascripts, tutorials, references, DOM references, applets, DHTML.

The Javascript Source
The Javascript division of Internet.com

jQuery Javascript Library
Query is a fast, concise, JavaScript Library that simplifies how you traverse HTML documents, handle events, perform animations, and add Ajax interactions to your web pages.

Javascript Toolbox
Collection of Javascripts source, examples and concept from Mattkruse

Mini Ajax
Cool collection of AJAX scripts you can port to your website in no time.

Mochikit
Making Javascripts suck a bit less.

moo.fx
moo.fx is a superlightweight, ultratiny, megasmall javascript effects library, to be used with prototype.js or the mootools framework.

Page Resource

script.aculo.us
script.aculo.us provides you with easy-to-use, cross-browser user interface JavaScript libraries to make your web sites and web applications fly.

Server Scripts

Tutorialized

W3Schools Javascript Tutorials