Apps similar to Swish include AutoHotkey, which is free and open source. Other options are BetterTouchTool, Karabiner Elements, Loop - Window Management and AquaSnap. Window Managers like Swish are a crowded field, with more than 50 alternatives for Mac, Windows, Linux and Android.
Penc is a window manager app for macOS designed for use with the trackpad. It lets you use trackpad gestures along with the Command key to move, resize and snap windows to the screen.
SizeUp allows you to quickly position a window to fill exactly half the screen (splitscreen), a quarter of the screen (quadrant), full screen, or centered via the menu bar or configurable system-wide shortcuts (hotkeys).
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Easy Move+Resize is based on behavior found in many X11/Linux window managers, adding easy modifier key + mouse drag move and resize to OS X.
Arrange your application windows using nothing but drag and drop! There are no hot-keys to remember or menus to click, just drag and drop a window onto Layout Icon and it will instantly snap to that layout.
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Give fresh new look to your phone with Fluid N.G, the navigation gestures app inspired by Breccia's concept.
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Mosaic allows you to effortlessly resize and re-position windows on your Mac with a simple Drag & Drop, seamlessly integrated into macOS.
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WinNumpad Positioner is a lightweight and snappy Windows management tool that repositions Windows using simple Windows Key + Numpad combinations.
Arrange, resize, snap, and move windows in OS X with the help of keyboard shortcuts, certain window dragging gestures, or using OS X's window buttons.
