History Ītom was developed in 2008 by GitHub founder Chris Wanstrath as a text editor using the Electron Framework (originally called Atom Shell), a framework designed as the base for Atom. All types of packages, including but not limited to: Syntactic highlighting support for languages other than the default, debuggers, etc. Packages could be installed, managed and published via Atom's package manager apm.

Like most other configurable text editors, Atom enabled users to install third-party packages and themes to customize the features and looks of the editor. Ītom used Tree-sitter to provide syntax highlighting for multiple programming languages and file formats. Ītom was initially written in CoffeeScript and Less, but much of it was converted to JavaScript before retirement. Electron is a framework that enables cross-platform desktop applications using Chromium and Node.js.

It was based on the Electron framework, which was developed for that purpose, and hence was formerly called Atom Shell. Ītom was a desktop application built using web technologies. Features Ītom was a 'hackable' text editor, which means it was customizable using HTML, CSS, and JavaScript. On June 8, 2022, GitHub announced Atom's end-of-life, occurring on December 15 of the same year, justifying its need 'to prioritize technologies that enable the future of software development', specifically its GitHub Codespaces and Visual Studio Code, developed by Microsoft which had acquired Github in 2018. Developed by GitHub, Atom was released on June 25, 2015.

MacOS 10.9 or later, Windows 7 and later, and Linux Ītom was a free and open-source text and source code editor for macOS, Linux, and Windows with support for plug-ins written in JavaScript, and embedded Git Control. CoffeeScript, JavaScript, Less, HTML (front-end/UI)

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