mapper.js

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mapper.js 1.2 allows you to add automatic area highlighting to image maps on your webpages (inc. export to SVG). It works in all the major browsers - Mozilla Firefox 1.5+, Opera 9+, Safari and IE6+. On older browsers, it can use "jsgraphics" from Walter Zorn (if installed), else it'll degrade and your visitors won't notice a thing.

Javascript Speed Test: Test your browsers

Jason Orendorff has created a JavaScript speed testthat you can run inline in your browsers.

No one is sure of the usefulness, but it can provide hours of fun as you run the tests on each of your browsers / systems :)

Reflex 1.1: Cover Flow for Javascript

reflex.js 1.1 allows you to add a Cover Flow™ effect (including reflection) to images on your webpages. *Cover Flow is a trademark of Apple Inc. It works in all the major browsers - Mozilla Firefox 1.5+, Opera 9+, Safari and IE6+. On older browsers, it'll degrade and your visitors won't notice a thing.

curl.js (with IE 6/7 support)

curl.js 1.0 allows you to add an page curl effect (inc. backside mask) to images on your webpages. It uses unobtrusive javascript to keep your code clean. It works in all the major browsers - Mozilla Firefox 1.5+, Opera 9+, Safari and IE6+. On older browsers, it'll degrade and your visitors won't notice a thing.

shiftzoom.js (zoom and pan functionality)

shiftzoom.js 1.0 allows you to add zoom and pan functionality to oversized images on your webpages. It uses unobtrusive javascript to keep your code clean. It works in all the major browsers - Mozilla Firefox 1.5+, Opera 9+, IE 6+ and Safari. Works also on older browsers supporting images/ createElement/ getElementById, else it'll degrade and your visitors won't notice a thing.

JSRS

JSRS routes calls directly from Javascript into your server-side language and back out again, known browsers: IE4+, NS4.x, NS6.x, Mozilla, Opera7 and Galeon.

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.

jQuery

jQuery 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. jQuery is designed to change the way that you write JavaScript.

GWT(Google Web Toolkit)

Google Web Toolkit (GWT) is an open source Java software development framework that makes writing AJAX applications like Google Mapsand Gmaileasy for developers who don't speak browser quirks as a second language. Writing dynamic web applications today is a tedious and error-prone process; you spend 90% of your time working around subtle incompatibilities between web browsers and platforms, and JavaScript's lack of modularity makes sharing, testing, and reusing AJAX components difficult and fragile.

GWT lets you avoid many of these headaches while offering your users the same dynamic, standards-compliant experience. You write your front end in the Javaprogramming language, and the GWT compiler converts your Java classes to browser-compliant JavaScript and HTML.

newjs

A simple command-line tool to create the folders and helper files for a new JavaScript project/library. As a bonus, you can quickly create a website to promote your project.

When you start a new JavaScript library, how do you layout the source files, the tests, the distribution files? Do you have support scripts to generate distributions from source files? Run your JavaScript unit tests? Generators to create new unit test HTMLfiles?