Firebug integrates with Firefox to put a wealth of web development tools at your fingertips while you browse. You can edit, debug, and monitor CSS, HTML, and JavaScript live in any web page. Its features include:
 <UL>
	<LI>Inspect and edit HTML</LI>
	<LI>Tweak CSS to perfection</LI>
	<LI>Visualize CSS metrics</LI>
	<LI>Monitor network activity</LI>
	<LI>Debug and profile JavaScript</LI>
	<LI>Quickly find errors</LI>
	<LI>Explore the DOM</LI>
	<LI>Execute JavaScript on the fly</LI>
	<LI>Logging for JavaScript</LI>
 </UL>

Firebug integrates with Firefox to put a wealth of web development tools at your fingertips while you browse. You can edit, debug, and monitor CSS, HTML, and JavaScript live in any web page.

Firebug - Web Development Evolved.

Mapstraction is a library that provides a common API for various javascript mapping APIs to enable switching from one to another as smoothly as possible. Developers can code their applications once, and then easily switch mapping provider based on project needs, terms and conditions, and new functionality.
 
It currently supports Cartociudad, Cloudmade, GeoCommons, Google Maps & Google Earth,
Leaflet, MapQuest, Microsoft, OpenLayers, OpenSpace, Ovi, Yahoo and Yandex.

Mapstraction is a library that provides a common API for various javascript mapping APIs to enable switching from one to another as smoothly as possible. Developers can code their applications once, and then easily switch mapping provider based on project needs, terms and conditions, and new functionality.

Mapstraction - A Javascript Mapping Abstraction library

React Native lets you build mobile apps using only JavaScript. It uses the same design as React, letting you compose a rich mobile UI from declarative components. With React Native, you don't build a “mobile web app”, an “HTML5 app”, or a “hybrid app”. You build a real mobile app that's indistinguishable from an app built using Objective-C or Java. React Native uses the same fundamental UI building blocks as regular iOS and Android apps.

React Native - A framework for building native apps with React.

Draft.js is a JavaScript rich text editor framework, built for React and backed by an immutable model. Draft.js makes it easy to build any type of rich text input, whether you're just looking to support a few inline text styles or building a complex text editor for composing long-form articles.

Draft-js - A React framework for building text editors

React 360 is a framework for the creation of interactive 360 experiences that run in your web browser. It pairs modern APIs like WebGL and WebVR with the declarative power of React, producing applications that can be consumed through a variety of devices. Leveraging web technologies and the existing React ecosystem, React 360 aims to simplify the construction of cross-platform 360 experiences. Next, install the React 360 CLI – a command-line tool that generates the basic layout of new projects.

react-360 - Create amazing 360 and VR content using React

UglifyJS is a JavaScript parser, minifier, compressor and beautifier toolkit.  It can take multiple input files, It will parse input files in sequence and apply any compression options. The files are parsed in the same global scope, that is, a reference from a file to some variable/function declared in another file will be matched properly.

UglifyJS - JavaScript parser / mangler / compressor / beautifier library for NodeJS

Parse is the complete application stack. It helps to build applications faster with object and file storage,
user authentication, push notifications, dashboard and more out of the box. Parse Server is an open source backend that can be deployed to any infrastructure that can run Node.js.

Parse - The Complete Application Stack

React is a JavaScript library for building user interfaces. Lots of people use React as the V in MVC. React makes it painless to create interactive UIs. Design simple views for each state in your application, and React will efficiently update and render just the right components when your data changes. React can also render on the server using Node and power mobile apps using React Native.
 
React components implement a render() method that takes input data and returns what to display. Since component logic is written in JavaScript instead of templates, you can easily pass rich data through your app and keep state out of the DOM.

React is a JavaScript library for building user interfaces. Lots of people use React as the V in MVC. React makes it painless to create interactive UIs. Design simple views for each state in your application, and React will efficiently update and render just the right components when your data changes. React can also render on the server using Node and power mobile apps using React Native.

React - JavaScript library for building user interfaces

Relay is a JavaScript framework for building data-driven React applications. Never again communicate with your data store using an imperative API. Simply declare your data requirements using GraphQL and let Relay figure out how and when to fetch your data.
 
Queries live next to the views that rely on them, so you can easily reason about your app. Relay aggregates queries into efficient network requests to fetch only what you need. Relay lets you mutate data on the client and server using GraphQL mutations, and offers automatic data consistency, optimistic updates, and error handling.

Relay is a JavaScript framework for building data-driven React applications. Never again communicate with your data store using an imperative API. Simply declare your data requirements using GraphQL and let Relay figure out how and when to fetch your data.

Relay '- JavaScript framework for building data-driven React applications.

PhantomJS is a headless WebKit scriptable with a JavaScript API. It has fast and native support for various web standards: DOM handling, CSS selector, JSON, Canvas, and SVG. It is an optimal solution for headless website testing. It run functional tests with frameworks such as Jasmine, QUnit, Mocha, Capybara, WebDriver, and many others. 
 
It is capable to do screen capture. It could create web site screenshots with thumbnail preview. Automates performance analysis using YSlow and Jenkins.

PhantomJS is a headless WebKit scriptable with a JavaScript API. It has fast and native support for various web standards: DOM handling, CSS selector, JSON, Canvas, and SVG. It is an optimal solution for headless website testing. It run functional tests with frameworks such as Jasmine, QUnit, Mocha, Capybara, WebDriver, and many others.  

Phantomjs - Headless WebKit with JavaScript API

The Stanford Javascript Crypto Library is a project by the Stanford Computer Security Lab to build a secure, powerful, fast, small, easy-to-use, cross-browser library for cryptography in Javascript. SJCL is secure. It uses the industry-standard AES algorithm at 128, 192 or 256 bits; the SHA256 hash function; the HMAC authentication code; the PBKDF2 password strengthener; and the CCM and OCB authenticated-encryption modes.

sjcl - Stanford Javascript Crypto Library

hapi is a simple to use configuration-centric framework with built-in support for input validation, caching, authentication, and other essential facilities for building web and services applications. hapi enables developers to focus on writing reusable application logic in a highly modular and prescriptive approach. 

hapi - Web and Services Application Framework for Node.js 

Jest is a delightful JavaScript Testing Framework with a focus on simplicity. It works with projects using: Babel, TypeScript, Node, React, Angular, Vue and more. It provides instant feedback, fast interactive watch mode runs only test files related to changed files and is optimized to give signal quickly.

Jest - Delightful JavaScript Testing

Xinha (pronounced like Xena, the Warrior Princess) is a powerful WYSIWYG HTML editor component that works in all current browsers. Its configurabilty and extensibility make it easy to build just the right editor for multiple purposes, from a restricted mini-editor for one database field to a full-fledged website editor. Its makes it an ideal candidate for integration into any kind of project.

Xinha - The Community-built Open Source Online HTML Editor

Protovis composes custom views of data with simple marks such as bars and dots. Unlike low-level graphics libraries that quickly become tedious for visualization, Protovis defines marks through dynamic properties that encode data, allowing inheritance, scales and layouts to simplify construction. Protovis is a graphical toolkit, designed for visualization. It retains some of the conceptual simplicity and low-level control of graphical systems by dealing directly with graphical elements.

Protovis - A graphical approach to visualization

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