TinyMCE!

CKEditor is an open source WYSIWYG rich text editor and collaboration solution designed to bring common word processor features directly to web pages, simplifying their content creation.

Trumbowyg is a very small jQuery plugin (16 kB minified) for creating a powerful WYSIWYG editor. Features:

WYSIWYG Editor built with jQuery, Bootstrap and Font-Awesome. MIT-licensed. 2500+ stars on GitHub.

Introduction

Alloy Editor is a modern WYSIWYG editor built on top of CKEditor, designed to create modern and gorgeous web content.

A lightweight WYSIWYG BBCode & HTML editor

Modern WYSIWYG HTML5 editor

CLEditor is an open source jQuery plugin which provides a lightweight, full featured, cross browser, extensible, WYSIWYG HTML editor that can be easily added into any web site.

Squire is an HTML5 rich text editor, which provides powerful cross-browser normalisation, whilst being supremely lightweight and flexible. It is built for the present and the future, and as such does not support truly ancient browsers. It should work fine back to around Opera 12, Firefox 3.5, Safari 5, Chrome 9 and IE9.

markItUp! is a JavaScript plugin built on the jQuery library. It allows you to turn any textarea into a markup editor. Html, Textile, Wiki Syntax, Markdown, BBcode or even your own Markup system can be easily implemented.

Aloha Editor is an HTML5 WYSIWYG Editor that gives you a total new experience when editing. It's faster than existing WYSIWYG technologies and offers unprecedented WYSIWYG functionalities.

WYMeditor is a web-based WYSIWYM (What You See Is What You Mean) XHTML editor (not WYSIWYG).

Redactor Text Editor is a WYSIWYG html editor.Redactor provides smooth and clean design, limitless flexibility and extensibility, simple and super-efficient API and amazing user experience.

ORY Editor is a React based editor for the web built that follows some important principles in modern web development.