Plumb - Plumb is designed to reduce the time spent manually moving windows on your desktop.
AquaSnap - Too many windows on your screen? Stop wasting your productivity.
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).
Mizage Divvy - Divvy is an entirely new way of managing your workspace.
Better Window Manager - A tiny window management app for the Mac
Magnet Window Manager - Magnet Developers