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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.
Essentially it creates a VPN configuration to allow it to filter traffic (necessary for that to work), but your traffic isn't actually routed through an external server like a real VPN. It blocks requests for personally identifiable data (device information, personal information, etc.) going to third-party domains that have been added to the DuckDuckGo Tracker Radar dataset. This makes it harder for ad companies to fingerprint you and track your activity across apps and websites for the purpose of targeted advertising.