Knockout
Knockout makes it easier to create rich, responsive UIs with JavaScript
Zxcvbn
zxcvbn, named after a crappy password, is a JavaScript password strength estimation library. Use it to implement a custom strength bar on a signup form near you!
C3
A D3-based reusable chart library
Popmotion
A 12kb Javascript motion engine. Use for animation, physics and input tracking.
Pikaday
A refreshing JavaScript Datepicker — lightweight, no dependencies, modular CSS
Vivus
JavaScript library to make drawing animation on SVG
Raphael
JavaScript Vector Library
Magnific Popup
Light and responsive lightbox plugin with focus on performance.
Interact.js
Drag and drop, resizing and multi-touch gestures with inertia and snapping for modern browsers (and also IE8+)
Tippyjs
Highly customizable vanilla JS tooltip/popover library
Watermelon Db
🍉 High-performance reactive database for powerful React and React Native apps ⚡️
Chai
BDD / TDD assertion framework for node.js and the browser that can be paired with any testing framework.
Bootstrap Datetimepicker
Date/time picker widget based on twitter bootstrap
Go Js
All GoJS samples, extensions, and documentation
Vis
Dynamic, browser-based visualization library
Flot
Flot is a pure JavaScript plotting library for jQuery, with a focus on simple usage, attractive looks and interactive features.
Pickadate.js
lightweight jquery date selector with multi-language support