CKEditor - Real-time collaborative future-ready rich text editor
CKEditor 4 - CKEditor 4 is a rich text editor that enables you to write content inside of web pages or online applications.
Aloha Editor - Aloha Editor is an HTML5 WYSIWYG Editor that gives you a total new experience when editing.
WYMeditor - WYMeditor is a web-based WYSIWYM (What You See Is What You Mean) XHTML editor (not WYSIWYG).
Froala Editor - Froala Editor is a WYSIWYG HTML editor that enables rich text editing capabilities for the applications.
Editor.js - A block-styled editor with clean JSON output