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mixed-reality-extension-sdk
Discontinued The Mixed Reality Extension SDK enables developers to build 3D world extensions for AltspaceVR, using Node.JS. (by microsoft)
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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.
We're still in the early stages of the second wave of VR. Sort of like the web was in the late 90's. Basic tools are there, but lots of gaps to fill. For example, AltspaceVR does not allow imported objects to have scripts, BUT it uses Microsoft's MRE to allow scripts on your server. Lots of opportunities for ecommerce, integrating with other services, etc.