Top Alternatives to Shiftit

BetterTouchTool is an app that allows you to configure many gestures for your Magic Mouse (1 & 2), Macbook Trackpad and Magic Trackpad (1 & 2) and also Mouse Gestures for normal mice.

Divvy an app to manage your workspace. It allows you to quickly and efficiently “divvy up” your screen into exact portions.

AquaSnap is a powerful window manager that helps you arrange and organize multiple applications on your desktop with minimum effort.

Preme for Windows speeds up your window switching.

altdrag is a simple tool to easily drag windows when pressing the alt key.

Cinch gives you simple, mouse-driven window management by defining the left, right, and top edges of your screen as 'hot zones'.

GridMove is a window management tool that can quickly arrange your windows into desktop grids.

BetterSnapTool allows you to easily manage your window positions and sizes by either dragging them to one of the screen's corners.

Sizer is a freeware utility that allows you to resize any window to an exact, predefined size. This is extremely useful when designing web pages, as it allows you to see how the page will look when viewed at a smaller size.

HyperDock for Mac lets you take a quick look at the windows you have open in each program when you hover over icons in the Dock.

Moom allows you to easily move and zoom windows.

SizeUp allows you to quickly resize and position your windows with keyboard shortcuts or a handy menu bar icon.