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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 don't think they have a time tracker, but https://cryptpad.fr/ has a whole suite of web-based end-to-end encrypted apps that you may find useful. There's also https://www.etesync.com/get-apps/ which is more oriented toward contacts, calendars, and tasks, but again i don't think there's a time-tracking app.
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.