Hammerspoon - This is a tool for powerful automation of OS X.
AutoHotkey - The ultimate automation scripting language for Windows.
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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SizeUp - SizeUp allows you to quickly resize and position your windows with keyboard shortcuts or a handy menu bar icon. Arranging windows on Mac OS X is tedious and imprecise.
AutoKey - A Python 3 port of AutoKey, the desktop automation utility for Linux and X11.