What are the best IDEs?

A free and open source IDE based on Electron and Atom, developed by Microsoft. Visual Studio Code or VS Code is an extensible IDE or coding editor that is loved by many developers around the globe. The editor combines a streamlined UI with advanced code assistance, code nagivation and intellisense.

A free and open-source IDE for macOS, Linux, and Windows developed by GitHub Inc. The application is build on the Electron framework and provides a wide eco-system of add-ons that can be used to extend the IDE further. Atom is loved by developers across the globe.

A loved text editor and IDE for web developers and designers that provides unmatched responsiveness. Sublime Text provides a wide selection of editing command including indenting or un-indenting, paragraph reformatting, line joining , multiple selections, regular expression search and replace, incremental find as you type, and preserve case on replace. The IDE can also be extended with community built packages to further improve language detection, auto-complete and intellisense features.

WebStorm is a smart JavaScript IDE developed by JetBrains. With WebStorm you can run unit testing and debug tests with Karma, Mocha, Protractor, and Jest. All tests are available in a handy tree-view within the editor itself and can easily be navigated to and inspected. WebStorm also provides intelligent code competition, error detection, powerful navigation and refactoring for JavaScript, TypeScript, stylesheet languages and popular JavaScript frameworks.

PhpStorm is a commercial, cross-platform IDE specifically designed for PHP developers. The IDE provides on-the-fly code analysis, error prevention and automated refactoring for PHP, HTML and JavaScript code. PhpStorm is loved by professional Symfony, Laravel, Drupal, WordPress, Zend Framework, Magento, Joomla!, CakePHP, Yii developers across the globe.

Anjuta is an IDE (integrated development environment) developed for the GNOME Project. With Anjuta developers can work with programming languages like C, C++, Java, JavaScript, Python and Vala. The IDE provides full Glade integration that can be used for WYSIWYG UI development for GTK+/GNOME applications and GDE integration for onboard debugging.

GNU Emacs is an extensible and customizable, free and open source text editor. It was created by GNU Project founder Richard Stallman and has been dubbed "the most powerful text editor available today". At the core of GNU Emacs is an interpreter for Emacs Lisp, a dialect of the Lisp programming language with extensions to support text editing. Which allows users to extend and customize GNU Emacs to their heart's content.

A free and open-source lightweight GUI text editor using Scintilla and GTK with basic IDE features. Geany is designed and developed with performance in mind, and provides limited dependency on separate packages or external libraries on Linux. Geany is available for a wide variety of operating systems including BSD, Linux, macOS, Solaris and Windows.

MonoDevelop is a free and open-source IDE (Integrated Development Environment) for macOS, Linux and Windows. The software primary focus is to provide and IDE specifically for Mono and .NET frameworks. MonoDevelop features intellisense automatic code completion, source control, a graphical user interface.