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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.
So, what's the client you should use? There are many. For Windows/MacOS/Linux, maybe qBitTorrent? For Android, there's Flud, LibreTorrent, etc. If on iOS/iPhone/iPad, there's no app because Apple doesn't allow it (lol..), but you can use a "web client" like https://instant.io/ which behaves like the program/app. You'll need to keep the window open while it downloads and in this website's case, it doesn't accept torrent files (available on the site linked above), so you need to convert the torrent files to "magnet links" (essentially the torrent file in a link form) ยป copy the magnet link ยป paste it on the web client ยป download. It's easier to use a program.