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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.
From the mac side we were able to launch a Catalyst app on the mac store that utilized the same codebase as our iOS apps, so we deliver a "desktop-like" application for Mac, but unfortunately we do not have similar technology offered on the Windows side. We have been exploring the potential of utilizing web technologies with desktop wrappers (things like tauri, electron, etc.) to deliver better support for finding + filling info on desktop, but have no timeline or commitment on whether we will move forward with offering something like that (although I hope we do!). We also released the Dashlane CLI that could potentially be leveraged for accessing vault data from multiple platforms / with a GUI wrapper.