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.
surveyjs.io
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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.
As u/BehindTheMath mentioned owasp is a great place to start. In addition to the top 10 it's also worth going through their other content like the web security testing guide. Other than that, IMO the best way to become good at building secure applications is to become good at exploiting insecure ones webgoat can help with that.
NOTE:
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Hence, a higher number means a more popular project.