JSLint is a JavaScript program that looks for problems in JavaScript programs. It is a code quality tool.
CoffeeScript is a little language that compiles into JavaScript. Think of it as JavaScript's less ostentatious kid brother — the same genes, roughly the same height, but a different sense of style. Apart from a handful of bonus goodies, statements in CoffeeScript correspond one-to-one with their equivalent in JavaScript, it's just another way of saying it.
Repository of utility libraries that can be used with the Google Maps JavaScript API v2.
Besides form controls, alerts & similar simple JavaScript usage, you can almost do anything with the help of JavaScript (& Canvas). Some samples are: * Drag’n drops * Animations * CSS manipulations, Ajax & more.
Scriptaculous, MooTools, jQuery and much more: all you need to develop modern web interfaces and add new features to your website.
SoundManager 2 is a Javascript Sound API which talks to Flash, effectively mapping most of Flash 8's native sound capabilities to Javascript. It enables web developers and front-end engineers to programmatically control sound in a cross-browser/platform
Note that Firefox 2.0.0.11, IE 7, and Safari 3.0.3 beta all get some of the regex wrong.
A small tutorial on how to build a password strength meter like the one on Google's new account form.