Normalize.css
A modern, HTML5-ready alternative to CSS resets (as used by Twitter Bootstrap, HTML5 Boilerplate, TweetDeck, Soundcloud, and many others).
Mustache.js
Minimal templating with {{mustaches}} in JavaScript
Jsviews
Interactive data-driven views, built on top of JsRender templates
Jquery Transit
Super-smooth CSS3 transformations and transitions for jQuery
Cyclejs
A functional and reactive JavaScript framework for predictable code
Bluebird
Bluebird is a full featured promise library with unmatched performance.
Wow
Reveal CSS animation as you scroll down a page
jQuery Textcomplete
Introduce autocompleting power to textareas, like GitHub comment forms have.
Q
A tool for making and composing asynchronous promises in JavaScript
Odometer
Smoothly transitions numbers with ease. #hubspot-open-source
Jszip
Create, read and edit .zip files with Javascript
Chart.js
Simple HTML5 Charts using the <canvas> tag
Webshim
Webshims Lib is a modular capability-based polyfill-loading library
Lucia
🙋♀️ 3kb library for tiny web apps
Backbone Layout Manager
A layout and template manager for Backbone.js applications.
Hitch
A lightweight engine that allows you to hitch new capabilities to the browser (prollyfill).
jScrollPane
Pretty, customisable, cross browser replacement scrollbars