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deck-of-dice
This program replaces the dice in Catan. The program uses a deck which consists of 36 dice cards to represent the 36 different combinations that can be rolled with 2 dice. This means that number "rolls" are evenly distributed according to its probability.
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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.
react native let's you write apps in react that can be (automatically) ported to both android and ios. https://expo.dev/ makes everything easier imo. you still need to pay in order to publish to apple marketplace though, that's why I've only published https://github.com/fiskhandlarn/deck-of-dice for android so far.