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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'm currently building Market, an e-commerce service that has two RN apps (one for merchants and the other for shoppers) and a Node backend. It's completely open-source and has been a side project of mine for a while now. Would love to get some feedback on the code, which you can check it out on GitHub here: https://github.com/overthq/Market. Would also appreciate contributions as well, as I'm planning to launch it in a couple of months, and I still have a lot to get done.