yepnope.js : A Conditional Loader For Your Polyfills!
Microjs : Fantastic Micro-Frameworks and Micro-Libraries for Fun and Profit!
D3.js : D3.js is a JavaScript library for manipulating documents based on data. D3 helps you bring data to life using HTML, SVG and CSS. D3’s emphasis on web ...
Rainbow is a code syntax highlighting library written in Javascript.
It was designed to be lightweight (1.4kb), easy to use, and extendable.
It is completely themable via CSS.