Zepto
Zepto.js is a minimalist JavaScript library for modern browsers, with a jQuery-compatible API
Bootstrap Daterangepicker
Date range picker component for Bootstrap
C3
A D3-based reusable chart library
Chartist Js
Simple responsive charts
Velocity
Accelerated JavaScript animation.
Dragula
:ok_hand: Drag and drop so simple it hurts
Ol3
OpenLayers 3
Popper.js
A kickass library to manage your poppers
Platform
Reactive libraries for Angular
Grapesjs
Free and Open source Web Builder Framework. Next generation tool for building templates without coding
Prism
Lightweight, robust, elegant syntax highlighting. A spin-off project from Dabblet.
Selectize.js
Selectize is the hybrid of a textbox and <select> box. It's jQuery based and it has autocomplete and native-feeling keyboard navigation; useful for tagging, contact lists, etc.
Nock
HTTP mocking and expectations library
Mjml
MJML: the only framework that makes responsive-email easy
Jimp
An image processing library written entirely in JavaScript for Node, with zero external or native dependencies.
Mathjs
An extensive math library for JavaScript and Node.js