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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.
You can play with it at https://thirdroom.io or hop straight into a world like https://thirdroom.io/world/#terra-1:thirdroom.io. The code is all Apache Licensed up at https://github.com/matrix-org/thirdroom. We're hoping this provides a much-needed counterbalance to the Big Tech visions of the metaverse, or ones which are entangled with decentralised financial incentives, and might be a genuinely open platform for building spatial web/metaverse apps in future.