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SurveyJS
Open-Source JSON Form Builder to Create Dynamic Forms Right in Your App. With SurveyJS form UI libraries, you can build and style forms in a fully-integrated drag & drop form builder, render them in your JS app, and store form submission data in any backend, inc. PHP, ASP.NET Core, and Node.js.
Hello u/ren3f I understand your concern, Firstly We never store your emails, all the sent Emails are cleared from time to time, the server that we use is a opensource NPM package two-step-auth you can refer here also, and we have a dev server that only does the mailing part and we do not even store your emails, we run a free tier dev server without storage, and guaranteed we clean up all the emails that we send and also assure you that there will be no spam emails and no sharing of emails to third parties for any sort of exchange as we developed it in the motive of OPEN-SOURCE.