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Joplin
Joplin - the secure note taking and to-do app with synchronisation capabilities for Windows, macOS, Linux, Android and iOS.
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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.
In contrast, you can take a look at Standard Notes' privacy policy. Note that you don't have to pay the subscription to get their "premium" features - just use the awesome-standard-notes repository. Any themes, editors, etc. you install using the desktop app will sync to your phone app so you don't have to pay for anything like that.
Joplin Notes supports E2EE and open source.