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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.
If you don't like anonaddy specifically I think most VPN's have email forwarding now too and there other competing services like simplelogin.io, altmails.com, forwardemail.net
Found anonaddy.com after years of using various throwaway methods (alt gmail accounts, 10minutemail, guerillamail and so on). Honestly so damn convenient to have separate addresses for all sites that still ends up in my regular email account but that I can disable with just a button. I have a paid account but the free tier is very sufficient most most users I think.