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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.
I believe this particular discussion and decision is quite old and settled. The use of phone numbers is a usability and reliability trade-off that users need to be willing to make with Signal. If that's not fitting of your threat model, may I suggest https://matrix.org/
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.