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worldbuilding
A simple game system for Foundry VTT which allows for flexible definition of Actors and Items to assist with worldbuilding or for running games which do not have a more complete system implementation available.
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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.
For Gold & Glory is an implementation of a system heavily based on AD&D 2e and can function as a good core for it. Simple and other system agnostic options can also be used for it. If you're wanting full in-built integration and automation though, your only option is, unfortunately, FGU still. Only VTT place its ever actually been licensed out to.