YUI3
YUI is a free, open source JavaScript and CSS library for building richly interactive web applications.
Wow
Reveal CSS animation as you scroll down a page
Scroll Trigger
Triggers classes on html elements based on the scroll position. Uses requestAnimationFrame so it doesn't jack the users scroll.
Rambda
Faster alternative to Ramda in just 10kB
Annyang
A javascript library for adding voice commands to your site, using speech recognition.
Store
A better way to use localStorage and sessionStorage
Remark
A simple, in-browser, markdown-driven slideshow tool.
Holmes
Fast and easy searching inside a page
Durandal
A cross-device, cross-platform client framework written in JavaScript and designed to make building Single Page Applications (SPAs) easy to create and maintain.
Csscomb.js
CSS coding style formatter
Chart.js
Simple HTML5 Charts using the <canvas> tag
Tfjs Core
WebGL-accelerated ML // linear algebra // automatic differentiation for JavaScript.
Ejecta
A Fast, Open Source JavaScript, Canvas & Audio Implementation for iOS
Autosize
jQuery plugin for dynamic textarea sizing
Air Datepicker
Cool jQuery datepicker
Radio
Dependency-free Chainable Publish/Subscribe Library for Javascript
Blaver
A JavaScript library built on top of the Faker.JS library. It generates massive amounts of fake data in the browser and node.js.