Atom is described as 'Open-source, Electron based text editor with a massive ecosystem of plugins and themes that are easily accessible through a built-in package manager. Being built with Electron, it uses web technology (HTML, CSS, JavaScript and Node' and is a leading Code Editor in the development category. There are more than 100 alternatives to Atom for a variety of platforms, including Windows, Linux, Mac, BSD and Web-based apps. The best Atom alternative is Visual Studio Code, which is free. Other great apps like Atom are Notepad++, Sublime Text, Vim and VSCodium.
Leafpad is a lightweight text editor that emphasizes simplicity. As development focuses on keeping weight down to a minimum, only the most essential features are implemented in the editor.
Textadept is a fast, minimalist, and ridiculously extensible cross-platform text editor for programmers. Written in a combination of C and Lua and relentlessly optimized for speed and minimalism over the years, Textadept is an ideal editor for programmers who want endless...
Vim inspired text editor with support for multiple selections and scores of other "out of the box" features.
jEdit is a mature programmer's text editor with hundreds (counting the time developing plugins) of person-years of development behind it. jEdit beats many expensive development tools for features and ease of use AND it is released as free software with full source code...
A lightweight yet powerful IDE/code editor that comes in both Web and desktop editions, the latter written with PHP and including choices for several platforms (Windows, Linux, Mac).
Graviton Code Editor is a minimalist, cross-platform editor focused on speed, customization and productivity.
ReText is a simple text editor for Markdown and reStructuredText documents with syntax highlighting and optional live preview.
Light Table is a new interactive IDE that lets you modify running programs and embed anything from websites to games. It provides the real time feedback we need to not only answer questions about our code, but to understand how our programs really work.
Builder is an actively developed Integrated Development Environment for GNOME. It combines integrated support for essential GNOME technologies such as GTK+, GLib, and GNOME APIs with features that any developer will appreciate, like syntax highlighting and snippets.
Does not rely on Electron. Loads of plugins and tweaks make this a great IDE. Simple design as you'd expect from a Gnome app, but don't let that disract you from how powerful it is.
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Graviton is very lightweight compared to Atom and it does not send any data to any server. Its plugin system is still young but it's almost at the level of Atom's.