Vex : Vex is a modern dialog library which is highly configurable, easily stylable, and gets out of the way. You'll love vex because it's tiny (6kb minified...
RequireJS : RequireJS is a JavaScript file and module loader. It is optimized for in-browser use, but it can be used in other JavaScript environments, like Rhino ...
Head JS : Load scripts like images. Use HTML5 and CSS3 safely. Target CSS for different screens, paths, states and browsers. Make it the only script in your HEA...
Push by Nickersoft : A compact, cross-browser solution for using the JavaScript Notifications API
loglevel : Minimal lightweight logging for JavaScript, adding reliable log level methods to wrap any available console.log methods
Add Clippy or his friends to any website for instant nostalgia.