Atom is a hackable text editor created by GitHub and developed on top of the Electron desktop application platform. Development has fallen off, and it will be sunset as of December 15, 2022.
Atom is an open source text editor created originally for OS X by GitHub. It can be downloaded for free from atom.io for OS X, Windows, and Linux, or it can be built from source on any platform.
On June 8, 2022, GitHub announced that Atom will be sunset as of December 15, 2022, after development had fallen off for years.
Atom, like Visual Studio Code, is largely built in JavaScript, LESS, HTML5, and CoffeeScript on top of GitHub's Electron desktop platform, which itself is built in C++. Atom distinguishes itself from other text editors by providing tight Git integration out of the box and an extensibility model familiar to JavaScript and Node developers.
For new users of Atom, the Atom Flight Manual provides basic information on how the editor works and ways to extend it through packages, custom init scripts, and keymaps. There is also a guide for creating your own packages.
For more in-depth discussions on how to use and extend Atom, visit Atom's Discuss Board, which is frequented by a number of GitHub and community developers.