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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.
Syncthing actually doesn't provide a way to view your files online, you have to set up an instance on your local computer then have the files synced to there and then view them locally. However, on the forums I have found links to something that people seem to recommend for viewing files online, a sort of enhanced web index: https://github.com/lrsjng/h5ai.
Checkout https://awesome-selfhosted.net/tags/file-transfer---web-base...
I've used https://filebrowser.org/ and it's okay. I've also Seafile, but my current setup is sftp clients (Transmit nowadays) and Syncthing if I need the files on multiple computers.