Text Editing
Rich-text editors using contenteditable
32_ENTRIES- Slate
Rich text editor built on top of React and Immutable
- TipTap
Rich text editor for Vue.js
- Trix
Basecamp's rich text editor
- CKEditor
Started back in 2003. Has both iframe and inline style rich-text editing
- Squire
HTML5 rich text editor
- ProseMirror
From the maker of CodeMirror
- Quill
Quill is a free, open source WYSIWYG editor built for the modern web
- Summernote
Bootstrap dependent rich-text editor
- wysihtml
Made by Voog
- Etherpad
Open Source online editor providing collaborative editing in really real-time
- TinyMCE
Used by much of the wordpress and drupal community
- Textbox.IO
From the makers of TinyMCE
- Froala
A simple to use rich text editor, with mobile support, lots of examples, high performance and inline editing
- Redactor
Advanced, clean and smooth, Redactor Rich Text Editor offers an excellent immersive user experience
- Ritzy
Collaborative web-based rich text editor
- Aloha Editor
Open Source browser based html5 enabled rich text editor
- WYMeditor
Open Source XHTML editor focusing on semantic markup
- Dijit Editor
a Dojo-based rich text editor component
- YUI Rich Text Editor
a Yahoo! rich text editor component
- KindEditor
Open Source HTML editor
- Hallo
Simple rich text editor (contentEditable) for jQuery UI
- markitup
universal markup jQuery editor
- openwysiwyg
Free cross-browser WYSIWYG editor
- tejQuery
Lightweight (19.5 KB) and very useful HTML editor
- Trumbowyg
light, translatable and customisable jQuery plugin
- NicEdit
Abandoned in 2012
- jWYSIWYG
WYSIWYG jQuery Plugin
- Alloy
a modern WYSIWYG editor built on top of CKEDITOR
- Draft.js
a rich text editor framework for React
- MediumEditor
A clone of medium.com inline editor toolbar. Uses contenteditable API to implement a rich text solution.
Code editors
6_ENTRIES- Yace
1KB code editor for browser with plugins
- CodeJar
CodeJar is a micro code editor for the browser
- CodeMirror
CodeMirror is a versatile text editor implemented in JavaScript for the browser
- Ace
Ace is an embeddable code editor written in JavaScript
- Behave.js
lightweight library for adding IDE style behaviors to plain text areas
Markdown editors
2_ENTRIES- markdown-js
A Markdown parser for javascript
- pagedown
PageDown is the JavaScript Markdown previewer used on Stack Overflow and the rest of the Stack Exchange network