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CodeMirror is a versatile text editor implemented in JavaScript for the browser. It is specialized for editing code, and comes with a number of language modes and addons that implement more advanced editing functionality.
Quiver is a notebook built for programmers. It lets you easily mix text, code, Markdown and LaTeX within one note, edit code with an awesome code editor, live preview Markdown and LaTeX, and find any note instantly via the full-text search.
Advanced, clean and smooth, Redactor Rich Text Editor offers an excellent immersive user experience. Small and robust, Redactor is the #1 choice for thousands of professional developers worldwide.
What You See Is What You Get (WYSIWYG)
THIS is the typewriter for the modern web.
Beautiful WYSIWYG HTML Editor | Rich Text Editor
Super Simple WYSIWYG editor on Bootstrap
the <textarea> of the future
Just another Medium editor clone.
Aloha Editor is a JavaScript content editing library.
Aloha Editor provides you capabilities to create editing experiences embedded seamlessly in your web application.
Build and debug modern web and cloud applications. Code is free and available on your favorite platform - Linux, Mac OSX, and Windows.
An Open Source Rich Text Editor with an API
Etherpad is a highly customizable Open Source online editor providing collaborative editing in really real-time.
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.
Experimental Sublime Text clone
Smart, Lightweight and Portable IDE for faster and easier web development.
The power of styling is now in your hands. bluePen can be easily installed even on a dynamic website.
FriendCode makes it easy to code, search and work with friends from anywhere.
Codiad is a web-based IDE framework with a small footprint and minimal requirements.
Etch is a content editor built on Backbone.js and is designed to be easily plugged into your Backbone app.