hunt : Library to detect when DOM elements become visible and disappear on scroll.
JavascriptOO : Every javascript project you should be looking into.
With examples, categories, install commands, CDN links, project and author stats, and more.
Dropzone.js : DropzoneJS is an open source library that provides drag'n'drop file uploads with image previews.
Microjs : Fantastic Micro-Frameworks and Micro-Libraries for Fun and Profit!
Ember.js : A JavaScript framework for creating ambitious web applications
Modest Maps is a small, extensible, and free library for designers and developers who want to use interactive maps in their own projects.