WindowTidy has been discontinued. Similar apps include Rectangle, which is open source with a free version. Other options are BetterTouchTool, SnapZones, AquaSnap and MacsyZones. Window Managers like WindowTidy are a crowded field, with more than 50 alternatives for Mac, Windows, Linux and Android.
Chameleon Window Manager will allow you to control the windows of your programs using customizable buttons added to the title bars of the windows (Always on Top, Minimize to Tray, Minimize to Caption, Specify Transparency, Position window at left/right of screen).
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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).
United States
Slate is a window management application similar to Divvy and SizeUp (except better and free!). Originally written to replace them due to some limitations in how each work, it attempts to overcome them by simply being extremely configurable.
Windownaut is versatile window management app that let's you define keyboard shortcuts and active areas on your screen to resize an position the windows on your desktop.
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.
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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