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TinyMCE - TinyMCE is a content editor that functions as a plug-in for Wordpress websites.
Summernote - Summernote is a JavaScript library that helps users create WYSIWYG editors online.
Froala Editor - Froala Editor is a WYSIWYG HTML editor that enables rich text editing capabilities for the applications.
Quill - Powerful, API-driven rich text editor
SCEditor - A lightweight WYSIWYG BBCode & HTML editor