Atom Text Editor

Atom was a free and open-source text and source code editor developed by GitHub (now Microsoft). Created in 2014 and officially sunset (archived) in December 2022, Atom was known as 'the hackable text editor' due to its deep extensibility through web technologies. Built on Electron (which was originally extracted from Atom itself), Atom allowed developers to customize nearly every aspect of the editor using JavaScript, CSS, and HTML. Key features: Electron-based: the entire editor UI was rendered using Chromium and Node.js, making it cross-platform and web-technology-friendly. This architecture allowed web developers to extend the editor using familiar tools. Package ecosystem: over 8,000 community packages extended Atom with new languages, themes, linters, debuggers, and tools. Packages could be installed via the built-in package manager (apm, similar to npm). Teletype: a real-time collaborative editing feature allowing multiple developers to edit the same file simultaneously over a peer-to-peer CRDT-based connection. GitHub integration: built-in Git and GitHub integration, showing file changes, diffs, blame annotations, and pull request management directly in the editor. fuzzy finder: fast file and symbol navigation via Cmd-T/Cmd-P. Multiple panes: split the editor into multiple panes (horizontal and vertical) for side-by-side editing. Syntax highlighting: tree-sitter-based incremental parsing for fast and accurate syntax highlighting across over 100 languages. Atom IDE: a package providing language server protocol (LSP) integration for auto-completion, go-to-definition, diagnostics, and refactoring. Markdown preview: live preview of Markdown files side-by-side with the editor. While Atom was officially sunset in 2022, the community fork Pulsar continues its legacy. MIT.