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Product Description
Building “Web 2.0″/Ajax” applications is all the rage right now, and there is a lot of complicated code involved, but a lot of budding web developers don’t realize that most of the hard work is already done for them, and available on the Web, through JavaScript libraries to provide most of that Ajax/DOM Scripting functionality out of the box, Application programming interfaces (APIs,) and hosting services such as Flickr and YouTube to provide all they need to easily… More >>

Web Development Solutions: Ajax, APIs, Libraries, and Hosted Services Made easy

Aptana is a JavaScript Tool with nice function, it can debug in Firefox and also can added the third party library.

Nicely, it also provides Eclipse Plugin.

Google recently published AJAX Libraries API. Simply explain, Google take some popular JavaScript framework on its server. So every body can use Google’s service and save our bandwidth. More important, Google compressed these framework so that it can improve the JavaScript  speed of transmission. Google include these JavaScript framework below right now.

• JQuery
• prototype
• script.aculo.us
• MooTools
• dojo

There are 2 ways to use the JavaScript framework.

The first way:

<script src="http://ajax.googleapis.com/ajax/libs/

prototype/1.6.0.2/prototype.js"> </script>

The other way:

<script src="http://www.google.com/jsapi"></script>
<script>   // Load jQuery   google.load("jquery", "1");
</script>

More information on Google AJAX Libraries API.