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Nginx Proxy Manager
Docker container for managing Nginx proxy hosts with a simple, powerful interface
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lua-resty-auto-ssl
On the fly (and free) SSL registration and renewal inside OpenResty/nginx with Let's Encrypt.
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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.
I dont think thats going to help to much, Nginx is just some building blocks for what you would need. Check out https://nginxproxymanager.com/
Hard mode it is! Check out open resty and this https://github.com/auto-ssl/lua-resty-auto-ssl if you want build something your self.