Mac only: Free utility Shades adds finer screen brightness controls to your Mac than the defaults. Once you install the Shades Preference pane and turn it on, you can brighten or darken your screen across a much wider range than the Mac's built-in controls, and make your laptop in bed much more bearable to your sleepy significant other or the guy on the red-eye flight in the next seat. Shades doesn't affect OS X's default controls and colour profiles. If you get carried away by the range Shades provides and dim your screen too dark, Alt+Esc will set it back to the default brightness. Thanks eyeRmonkey!