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The term used to refer to this type of editor is WYSIWYG, acronym of the English expression "What You See Is What You Get", refers to something like "What you see is what you get".
There are several WYSIWYG, as:
- Summernote: https://summernote.org
- Quilljs: https://quilljs.com
- Tinymce: https://www.tinymce.com
- Ckeditor: https://ckeditor.com
- Fckeditor: https://www.drupal.org/project/fckeditor
- Froola editor: https://www.froala.com/wysiwyg-editor
- Freetextbox: http://www.freetextbox.com (for Asp.net)
- Niceedit: http://nicedit.com
- Sceeditor: https://www.sceditor.com
It’s your choice which is best for you.