Stack is a productivity tool, that helps managing multiple open windows. It is most useful on big screens, very wide screens and multiple monitor configurations.
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WindowSpace Alternatives
WindowSpace is described as 'Powerful desktop enhancement utility for large monitors, widescreens and multi-monitor systems. Once installed, it allows you to manipulate windows in many new amazing ways – snap windows to the screen edges and other windows, move and resize them with keyboard' and is a Window Manager in the os & utilities category. There are more than 25 alternatives to WindowSpace for a variety of platforms, including Windows, Mac, Linux, PortableApps.com and File Explorer apps. The best WindowSpace alternative is DisplayFusion, which is free. Other great apps like WindowSpace are AquaSnap, Snap It!, WindowGrid and Divvy.