SoundManager 2 : Using HTML5 and Flash, SoundManager 2 provides reliable cross-platform audio under a single JavaScript API.
JSDB.io : JSDB is a collection of the best javascript libraries
Tracery : A story-grammar generation library for javascript. Write grammar objects, get generative stories.
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 ...
Timeline : Beautifully crafted timelines that are easy, and intuitive to use.
Modest Maps is a small, extensible, and free library for designers and developers who want to use interactive maps in their own projects.