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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.
You can see if there is error information when running kwin_x11 --replace &. Deprecated versions of KWin indeed seem to cause problems: https://github.com/nclarius/tile-gaps/issues/1 If you can give me more precise error information, I can see if it's worth changing the script for broader compatibility.
Floating Tiles is available in the KDE store: https://www.pling.com/p/1619690/ and on GitHub: https://github.com/nclarius/floating-tiles
Keyboard shortcut to swap the windows on the left and right halves of the screen: https://github.com/nclarius/KWin-window-positioning-scripts
automatic manual duplex printing: https://github.com/nclarius/automatic-manual-duplex-printing