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 hides all the clutter on your mac desktop with a single click.
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.
With Lunar you can control the brightness of you external monitors, directly from your menu bar.
MacOS app to change the screen brightness on the menubar.