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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.
gltf-viewer is best for just viewing scenes: Its UI is dead simple, you can navigate, choose cameras, playing animations, it meets the viewing needs, and... If you think about it, a web app is ideal, because new extensions are being officially ratified into gltf as time goes on. In a month or so it'll have gpu instance meshes, before long there'll be materialx... and I can't even name a non-web viewer that supports files with mesh compression or even gpu compressed textures yet. With a web app you can be sure it's up to date and should support features before they are even widely used