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fingerprintjs
Browser fingerprinting library. Accuracy of this version is 40-60%, accuracy of the commercial Fingerprint Identification is 99.5%. V4 of this library is BSL licensed.
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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.
With JavaScript enabled fingerprinting is pretty much impossible to completely avoid if the website is intent on making it happen. There's just too many data points and computational tricks that can be used. Check out https://fingerprint.com, I have found their demo is very good at tracking a browser across web sessions, including when using a fresh private mode instance with a new IP address.