Aloha Editor - Aloha Editor is an HTML5 WYSIWYG Editor that gives you a total new experience when editing.
CKEditor - Real-time collaborative future-ready rich text editor
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Summernote - Summernote is a JavaScript library that helps users create WYSIWYG editors online.
CoffeeCup HTML Editor - The CoffeeCup Free HTML Editor is a drag-and-drop HTML Editor with built-in FTP uploading.
Froala Editor - Froala Editor is a WYSIWYG HTML editor that enables rich text editing capabilities for the applications.