Docker
Docker is an open-source project, it is a container that makes it possible to use numbers of applications on the same old servers and it also makes it easy to package and ship programs. Docker container put on different pieces of software into a full-fledged file system which consist of every necessary thing which requires to run code, run time, system tools, system libraries. Its open standards architecture allows a container to run almost all Linux distributions. It's also used on Microsoft operating systems.

AngularJS
AngularJS is also known as Angular.js, it is an open-source web application framework. It is Model-View-Whatever (MVW) JavaScript AJAX framework. It extends HTML with markup for dynamic views and data binding. This framework is maintained by Google and the individual community. The main purpose of the community is to simplify both the development and the testing of such applications. It is written in JavaScript and supported cross-platform. AngularJS released under the MIT License.

React
React is also known as React.js, it is an open-source JavaScript library. It provides the view of the data given as HTML. It is used for creating user interfaces by Facebook and Instagram. The main purpose of developing React is to build large applications with data that changes over time. It is a flexible framework. It provides hooks that enable you to interface with other libraries and frameworks. It is written in JavaScript and supported across platforms. It's released under license 3-Clause BSD with a Facebook addendum.

Atom
The atom is an open-source hackable desktop text editor and source code editor for OS X, Linux, and Windows developed by GitHub. You can customize it according to your needs because it provides the freedom of customization. The atom can be used as an IDE and it is written in CoffeeScript. List of features provided by Atom are file system browser, provide multiple panes, Snippets, and Code folding, clean preferences UI, import TextMate grammars and themes, fuzzy finder for quickly opening files, multiple cursors and selections, and many more.

Brackets
Brackets is another open-source, lightweight editor for Web design, HTML, CSS, and JavaScript. It provides a real-time preview of your browser while changes to CSS and HTML and you'll instantly see those changes on screen. It provides the freedom of customization to build the best code editor for the web. It is written in JavaScript, HTML, CSS languages. It supported across platforms like Mac, Windows, and Linux. It is released under the MIT License.