AquaSnap - Too many windows on your screen? Stop wasting your productivity.
Winroll - WinRoll easily manages multiple open windows.
Mizage Divvy - Divvy is an entirely new way of managing your workspace.
RBTray Fork - A minor fork of RBTray
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).
WindowGrid - Quickly and easily layout windows on a dynamic grid using just the mouse.