Web application: add-on or component for the design of drag-and-drop email templates

I'm looking to build an email template designer like MailChimp like drag and drop. Is there any open source component or even shelves that you can tell me about?

This is also another example of what I am trying to achieve https://www.youtube.com/watch?v=2aotjicT3-s&feature=youtu.be

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put on hold as mainly based on the opinion of JonW 5 hours ago

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