NicEdit : WYSIWYG Content Editor, Inline Rich Text Application
wysihtml5 : an open source rich text editor based on HTML5 technology and the progressive-enhancement approach.
Slate : Slate is a completely customizable framework for building rich text editors.
Slate lets you build rich, intuitive editors like those in Medium, Dropbo...
Xinha : Xinha is a powerful WYSIWYG HTML editor component that works in all current browsers. Its configurabilty and extensibility make it easy to build just ...
Frend : A collection of accessible, modern front-end components.
Frend components are modest and dependency-free. They are built with web standards as a prior...
CKEditor is an open source WYSIWYG text editor designed to bring common word processor features directly to web pages, simplifying their content creation. Its core code is written in JavaScript.