Apps similar to iSnap include Rectangle, which is open source with a free version. Other options are BetterTouchTool, Loop - Window Management, AquaSnap and WinMux. You're spoiled for choice with Window Managers like iSnap: we list more than 25 alternatives for Mac, Windows and Android.
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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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.
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.
Tuck is a handy menu bar application that allows you to quickly and simply clear multi-window clutter by hiding windows under your screen edges.
Autumn is a full customizable window manager for Mac with a built-in IDE for coders to configure everything with JavaScript or TypeScript.
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.
