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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.
Appwrite is an open-source Backend-As-A-Service that abstracts all the complexity of building a modern application by providing you with a set of REST APIs for your core backend needs. Appwrite takes the heavy lifting for developers and handles user authentication and authorization, databases, file storage, cloud functions, Webhooks, and much more!
Flutter is an open-source framework by Google for building beautiful, natively compiled, multi-platform applications from a single codebase.