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).
Spectacle App - Move and resize windows with ease.
Shiftit - fikovnik has 62 repositories available. Follow their code on GitHub.
Divvy - Divvy is an entirely new way of managing your workspace.
AquaSnap - Too many windows on your screen? Stop wasting your productivity.
Hammerspoon - This is a tool for powerful automation of OS X.