Sizer

Sizer is a freeware utility that allows you to resize any window to an exact, predefined size.

17 Alternatives To Sizer

AquaSnap

Too many windows on your screen? Stop wasting your productivity.
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AutoSizer

Automatically maximize and resize your programs. Control their size, position, and even set them as Always On Top.
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BetterTouchTool

Nov 5, 2017 - BetterTouchTool is a great, feature packed 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.

Deskovery

Deskovery is an OS X window manager. Windowshade, align, resize, change transparency of your windows

Dexpot

If you don’t have Dexpot yet, the new update makes it a must-have tool for Windows, adding a ton of features to your desktop that you never knew you wanted.

GridMove

GridMove - A window management tool that can quickly arrange your windows into desktop grids.

KDE Mover-Sizer

KDE Mover-Sizer is a lightweight program enabling KDE-style alt-click moving and resizing for…

MinimOther

Endlessly minimizes all windows except the active one.

Moom

Move your mouse over the green zoom button in any window, and Moom’s mouse control overlay will appear (as seen in the above animation).
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Shiftit

fikovnik has 62 repositories available. Follow their code on GitHub.
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Spectacle App

Move and resize windows with ease.
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TransOther

Make all windows but the active one transparent. Features: User defined transparency level.
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WinDock

WinDock is a window manager ideal for large, or multi-monitor setups. Features:

WinSize2

WinSize2 moves and resizes windows. With a simple hotkey, new windows are added, adjusted or removed.
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WindowGrid

Quickly and easily layout windows on a dynamic grid using just the mouse.

WindowsPager

WindowsPager is a desktop-switcher/pager for Windows to manage virtual workspaces/desktops.

ZMover

Arrange windows and icons on your desktop and across all monitors. Download and try this 32-bit/64-bit software for Windows 10 through XP.