Build a Feed You Can Cut 'n Paste, will help you format a feed's display with the information you want to use on your web site. All you need to enter is the URL for the RSS source.
advanced open-source javascript based toolkit. qooxdoo continues where simple HTML is not enough anymore. This way qooxdoo can help you to get your rich web application interface done - easier than ever before
as simple as possible, but no simpler, it lets you open an HTML page (or pages, in succession) in a dialog box, mess around with it, then check for any elements that were leaked.
a lightweight Javascript library highly documented and well tested, that will help you get shit done, fast. We took all the good ideas we could find from our Python, Objective-C, etc. experience and adapted it to the crazy world of JavaScript.
Ever want to add drag and drop to your website? How about a cool animation or fade? Rico is an free, open javascript library that makes adding these features easy. Check out the demo, it's pretty slick.
AJS is a ultra lightweight JavaScript library that is around 1 and half year old. It is hugely inspired by MochiKit, but differs by being small. The current version is only 33 KB (uncompressed), whereas MochiKit is over 100 KB
integrates with Firefox to put a wealth of development tools at your fingertips while you browse. You can edit, debug, and monitor CSS, HTML, and JavaScript live in any web page.