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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.
Blender supports OpenXR. The only reason it wouldn't run on an OpenXR runtime like SteamVR would be bugs in said runtime (e.g. on Linux it wouldn't run on SteamVR because of this bug but on windows I believe it should be working).
Theoretically it supports OpenXR on windows. In practice? Good luck. But that's not because of SteamVR in particular, that's just browsers making it very difficult, e.g. https://github.com/aframevr/aframe/issues/4709 tl;dr: disabling various levels of sandboxes in the browsers may make it work but will also make the browser more insecure.