Apps with 'Dims background windows' feature

AES Crypt is an advanced file encryption utility that integrates with the Windows shell or runs from the Linux command prompt to provide a simple, yet powerful, tool for encrypting files using the Advanced Encryption Standard (AES).

Adjust the brightness of all monitors, screens and displays.

Too many windows to manage? Big display? Or getting lost in multiple monitors? HazeOver is for you! ? TRIAL version: HazeOver.com

DeskCover hides your desktop icons behind a beautiful cover and automatically highlights the active application’s window while hiding everything else.

If you want to concentrate on a task at hand on your Mac, Window Focus is an absolutely essential app.