Hammerspoon - This is a tool for powerful automation of OS X.
Magnet Window Manager - Magnet Developers
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).
Slidepad - iPad style multitasking on your Mac
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.
LayAuto - Automated window management for Mac ✨