AquaSnap - Too many windows on your screen? Stop wasting your productivity.
Better Window Manager - A tiny window management app for the Mac
Mizage Divvy - Divvy is an entirely new way of managing your workspace.
windOCD - Put Mac windows in their places!
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).
Janus Workspace Desktop - Unclutter your browser and be more productive