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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.
Cryptofights is using the Run framework as their underlying game engine/storage/BSV integration mechanism. It's a fun little framework. It stores large chunks of javascript source code in strange places, and expects users of the framework to load and run it in a provided sandbox, as a mean of doing smarter things with transactions. While stopping short of calling itself a smart contract platform, it nonetheless purports to let applications create "tokens, contracts, artwork, elections, games, digital pets, and more." It appears that Run is intended to allow users to use someone else's Run code and objects under some conditions, although their docs could be clearer on how and when exactly that would happen.