HazeOver is a nifty app that automatically highlights the front window by fading out all the background windows. A kind of dimmer switch that reduces distractions by fading out background windows.
HiddenMe
Hummingbird
Hummingbird is a menu bar app that allows easy moving and resizing of windows by holding modifier keys and dragging your mouse to move and resize windows.
Lunar
With Lunar you can control the brightness of you external monitors, directly from your menu bar.
