2020
A Markdown Editor for the 21st Century | Zettlr
2018

pell - jaredreich.com
2017

GitHub - WordPress/gutenberg: Printing since 1440. Development hub for the editor focus in core.

ProseMirror

Alloy Editor
2015

ContentBuilder.js - Write Anything Beautifully

Quill - A Rich Text WYSIWYG Editor with an API
2014
2013

Sir Trevor JS

BlueGriffon EPUB Edition

BlueGriffon, The next-generation Web Editor based on the rendering engine of Firefox
2012

Redactor WYSIWYG html editor

wysihtml5 - A better approach to rich text editing
2011

CLEditor - WYSIWYG HTML 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.