Awesome text editing !Awesome (https://cdn.rawgit.com/sindresorhus/awesome/d7305f38d29fed78fa85652e3a63e154dd8e8829/media/badge.svg) (https://github.com/sindresorhus/awesome)
A curated collection of text editing libraries, services, and resources for the web.

Rich-text editors using contenteditable
⟡ Slate (https://github.com/ianstormtaylor/slate) - Rich text editor built on top of React and Immutable
⟡ TipTap (https://github.com/scrumpy/tiptap) - Rich text editor for Vue.js
⟡ Trix (https://github.com/basecamp/trix) - Basecamp's rich text editor
⟡ CKEditor (http://ckeditor.com/) - Started back in 2003. Has both iframe and inline style rich-text editing
⟡ Squire (https://github.com/neilj/Squire) - HTML5 rich text editor
⟡ ProseMirror (http://prosemirror.net/) - From the maker of CodeMirror
⟡ Scribe (https://github.com/guardian/scribe) - From the Guardian (http://www.theguardian.com/) team
⟡ Quill (http://quilljs.com/) - Quill is a free, open source WYSIWYG editor built for the modern web
⟡ Summernote (http://summernote.org/) - Bootstrap dependent rich-text editor
⟡ wysihtml (http://wysihtml.com/) - Made by Voog
⟡ Etherpad (http://etherpad.org/) - Open Source online editor providing collaborative editing in really real-time
⟡ TinyMCE (http://www.tinymce.com/) - Used by much of the wordpress and drupal community
⟡ Medium.js (http://jakiestfu.github.io/Medium.js/docs/) - Warning: Not actually used by Medium (https://medium.com/)
⟡ Textbox.IO (https://textbox.io/) - From the makers of TinyMCE
⟡ Froala (https://www.froala.com/wysiwyg-editor) - A simple to use rich text editor, with mobile support, lots of examples, high performance and inline editing
⟡ Redactor (http://imperavi.com/redactor/) - Advanced, clean and smooth, Redactor Rich Text Editor offers an excellent immersive user experience
⟡ Ritzy (https://github.com/ritzyed/ritzy) - Collaborative web-based rich text editor
⟡ Aloha Editor (http://www.alohaeditor.org/Content.Node/index.html) - Open Source browser based html5 enabled rich text editor
⟡ WYMeditor (http://www.wymeditor.org/) - Open Source XHTML editor focusing on semantic markup
⟡ Dijit Editor (http://dojotoolkit.org/) - a Dojo-based rich text editor component
⟡ YUI Rich Text Editor (http://yui.github.io/yui2/) - a Yahoo! rich text editor component
⟡ KindEditor (https://github.com/kindsoft/kindeditor) - Open Source HTML editor
⟡ Hallo (https://github.com/bergie/hallo) - Simple rich text editor (contentEditable) for jQuery UI
⟡ markitup (http://markitup.jaysalvat.com/home/) - universal markup jQuery editor
⟡ openwysiwyg (http://www.openwebware.com/) - Free cross-browser WYSIWYG editor
⟡ tejQuery (http://jqueryte.com/) - Lightweight (19.5 KB) and very useful HTML editor
⟡ Trumbowyg (http://alex-d.github.io/Trumbowyg/) - light, translatable and customisable jQuery plugin
⟡ NicEdit (http://nicedit.com/) - Abandoned in 2012
⟡ jWYSIWYG (https://github.com/jwysiwyg/jwysiwyg) - WYSIWYG jQuery Plugin 
⟡ Alloy (http://alloyeditor.com/) - a modern WYSIWYG editor built on top of CKEDITOR
⟡ Draft.js (http://facebook.github.io/draft-js/) - a rich text editor framework for React
⟡ MediumEditor (https://github.com/yabwe/medium-editor) - A clone of medium.com inline editor toolbar. Uses contenteditable API to implement a rich text solution.

Code editors

⟡ Yace (https://solopov.dev/yace) - 1KB code editor for browser with plugins
⟡ CodeJar (https://medv.io/codejar/) - CodeJar is a micro code editor for the browser
⟡ CodeMirror (https://codemirror.net/) - CodeMirror is a versatile text editor implemented in JavaScript for the browser
⟡ Ace (https://ace.c9.io/#nav=about) - Ace is an embeddable code editor written in JavaScript
⟡ EditArea (http://www.cdolivet.com/editarea/editarea/exemples/exemple_full.html)
⟡ Behave.js (http://jakiestfu.github.io/Behave.js/) - lightweight library for adding IDE style behaviors to plain text areas


Markdown editors

⟡ markdown-js (https://github.com/evilstreak/markdown-js) - A Markdown parser for javascript
⟡ pagedown (https://code.google.com/p/pagedown/wiki/PageDown) - PageDown is the JavaScript Markdown previewer used on Stack Overflow and the rest of the Stack Exchange network

Heuristic for contenteditable rich-text editors

Editor should:
⟡ Be stable
⟡ Be open source
⟡ Handle soft breaks
⟡ Be able to manipulate styles on block level elements
⟡ Be able to manipulate styles on inline level elements
⟡ Be able to manipulate classes on block level elements
⟡ Be able to manipulate classes on inline level elements
⟡ Be able to alter custom attributes on block level elements
⟡ Be able to alter custom attributes on inline level elements
⟡ Cache the selection
⟡ Have iframing capabilities as well as inline mode capability
⟡ Change the tag type of nodes
⟡ Clear the format
⟡ Have a concise api
⟡ Support various module loaders
* AMD & Common.js
⟡ Should have an organization backing the service and have a potential paid support plan
⟡ Should copy & paste from Microsoft word


License

!CC0 (http://i.creativecommons.org/p/zero/1.0/88x31.png) (http://creativecommons.org/publicdomain/zero/1.0/)