An open source code editor for the web, written in JavaScript, HTML and CSS.

Text editors
The text editor is a sacred application for developers. Here's a showcase of some amazingly awesome open source editors.
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Open source API-compatible alternative to the text editor Sublime Text
TextMate is a graphical text editor for macOS 10.9+
Vim-fork focused on extensibility and usability
A web-based collaborative LaTeX editor
Sublime-like terminal-based text editor
A sublime text editor for Chrome OS
Komodo Edit is a fast and free multi-language code editor. Written in JS, Python, C++ and based on the Mozilla platform.
The code for leo-editor. branches.md describes the different branches
A community-driven Emacs distribution - The best editor is neither Emacs nor Vim, it's Emacs *and* Vim!
A community-driven modular vim distribution - The ultimate vim configuration

The Light Table IDE
Rethinking code editing.
Visual Studio Code
A modern and intuitive terminal-based text editor