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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.
Sure! Not sure about rust but I wrote this several years ago: https://github.com/share/sharedb (though now other people maintain it)
It uses some JSON OT code I wrote, which is without a doubt the most complex code I've ever written in my career: https://github.com/ottypes/json1
With each change we just send the missing operations. Https://wiki.seph.codes/reddit if you want to mess around and see it in action via wasm. The code which runs this wiki is here.