Mocha
A simple, flexible, fun javascript test framework for node.js & the browser. (BDD, TDD, QUnit styles via interfaces)
Modernizr
Modernizr is a JavaScript library that detects HTML5 and CSS3 features in the user’s browser.
Blueprint
A React-based UI toolkit for the web
Ember
Ember.js is a JavaScript framework that does all of the heavy lifting that you'd normally have to do by hand. There are tasks that are common to every web app; Ember.js does those things for you, so you can focus on building killer features and UI.
Gulp
The streaming build system
Babylon.js
Babylon.js: a complete JavaScript framework for building 3D games with HTML 5 and WebGL
Plyr
A simple HTML5, YouTube and Vimeo player
Impress.js
It's a presentation framework based on the power of CSS3 transforms and transitions in modern browsers and inspired by the idea behind prezi.com.
Pdf.js
PDF Reader in JavaScript
Phaser
Phaser is a light-weight 2D game framework for making HTML5 games for desktop and mobile browsers
Native Script
NativeScript is an open source framework for building truly native mobile apps with JavaScript. Use web skills, like Angular and Vue.js, FlexBox and CSS, and get native UI and performance on iOS and Android.
Knex
A query builder for PostgreSQL, MySQL and SQLite3, designed to be flexible, portable, and fun to use.
Aframe
:a: web framework for building virtual reality experiences.
Koa
Expressive middleware for node.js using ES2017 async functions
Sortable
Sortable — is a minimalist JavaScript library for reorderable drag-and-drop lists on modern browsers and touch devices. No jQuery. Supports Meteor, AngularJS, React and any CSS library, e.g. Bootstrap.
React Virtualized
React components for efficiently rendering large lists and tabular data
Quill
A cross browser rich text editor with an API