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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.
Rocket.Chat (https://rocket.chat/) comes to mind.
Do know that it's not an officially supported solution, but it works great. It does, however, require use of Docker. Felddy has a FoundryVTT Docker image: https://github.com/felddy/foundryvtt-docker
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.