Momentum brings physics to the Mac desktop. throw it in your System folder & reboot. Then, whenever you drag a window (and some other things) you will be able to toss it. It will bounce around the screen, until friction brings it to a rest. You can stop it prematurely by hitting any key except the arrow keys. That’s because the arrow keys give the window extra velocity in the appropriate direction.
The CDEV allows you to adjust the amount and direction of gravity, and the amounts of the Desktop friction and the bounce friction. You can also restrict the bounce activity to the Finder, and turn off the bounce sound. After closing the CDEV window, the new settings are retained. Also, clicking in the “bouncing icon” in the CDEV applies the new settings.