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!
Popmotion
A 12kb Javascript motion engine. Use for animation, physics and input tracking.
Vivus
JavaScript library to make drawing animation on SVG
C3
A D3-based reusable chart library
Pikaday
A refreshing JavaScript Datepicker — lightweight, no dependencies, modular CSS
Magnific Popup
Light and responsive lightbox plugin with focus on performance.
Raphael
JavaScript Vector Library
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