Building a JavaScript library - part 3: open-sourcing

A JavaScript utility library delivering consistency, modularity, performance, & extras.

A JavaScript library dedicated to graph drawing  Demo

A JavaScript library for formatting and manipulating numbers.  Demo

The JavaScript library for magical scroll interactions.  Demo

Introducing a mini-library of experimental page scroll effects.  Demo

Vue.js is a library for building interactive web interfaces.  

Microsoft Open Sources Cross-platform Serialization Library – Bond 

A Library for creating beautiful mobile shelfs in Javascript

a cross-platform library for building 2D games