Loglevel
Minimal lightweight logging for JavaScript, adding reliable log level methods to wrap any available console.log methods
Lodash
An alternative to Underscore.js, delivering consistency, customization, performance, and extra features.
Highlighter.js
Easily navigate the DOM and highlight the elements - http://720kb.github.io/highlighter.js/
Count Up.js
Animates a numerical value by counting to it
Connective
agent-based reactive programming library for typescript
Between.js
Lightweight JavaScript (ES6) tweening engine
Adapt
Adapt.js serves CSS based on screen width.
101
A modern JS utility library
Ratio.js
Rational numbers for Javascript
Css3 Finalize
Tired of adding prefix for each broswer when it comes to the new css3 attributes?
Hermes.js
Message and Error logger implementation
Typecast.js
Typecast.js :: Solving the simple problems
Terrificjs
Terrific JavaScript Framework
Skrollr Decks
skrollr plugin for fullpage presentation decks
Multiple.js
Sharing background across multiple elements using CSS
AutoCompleteJS
AutoCompleteJS Widget
Aload
Loads images, scripts, styles, iframes, videos and audio asynchronously.