I found this JSEclipse plugin easy to use and convenient. If you are already familiar with Eclipse, or even you do not have any experience with Eclipse, it is pretty straight forward to learn. The company that developed this plugin-InterAKT-has been acquired by Adobe. This probably means this product will be no longer supported…, but I am fine with this because it has more than I need for now.

If you are looking for a fancy Javascript debugger, you can always use firebug, or if you can afford $60, I recommend http://www.myeclipseide.com. You can try MyEclipse free for a 30-day trial membership to test the full products and see if it is right for you.

Where to download:

http://www.adobe.com/cfusion/entitlement/index.cfm?e=labs%5Fjseclipse

web tools platform: http://download.eclipse.org/webtools/downloads/

JSEclipse Tutorial:

https://www6.software.ibm.com/developerworks/education/os-eclipse-jseclipse/os-eclipse-jseclipse-ltr.pdf

- The sample demo from the tutorial:

Popular JS libraries:
http://blog.translation-help.net/2008/01/01/dojo-scriptaculous-prototype-facebook/