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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.
TheRipper93's Levels module. This lets you overlay parts of the map to add depth or even just to handle height more easily. This is both a visual effect and a mechanical one as it adjust the player's elevation as needed.
Monk's Active Tiles. Among many other things it lets you adjust player elevation similar to the Levels module. This is more useful if you won't be layering maps and just want the 2D landscape to have 3D elements (eg. top of a tower or a ledge, bottom of a crevice).