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remodel
Discontinued Remodel is a tool that helps iOS and OS X developers avoid repetitive code by generating Objective-C models that support coding, value comparison, and immutability.
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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.
Strict null safety, immediately and enums with associated values make a huge difference for me. It's all possible in obj c. Annotations are part of the language but it's not strict. And remodel like libraries https://github.com/facebook/remodel can cover immutabilty and enums but it's so much boilerplate.