Any software for adjusting the brightness of an external monitor?

Does anyone know a good software that controls the brightness of external monitors? It would be great if it had a system tray icon too.

Disclaimer: I don’t have any personal experience of this application…so use it “at your own risk”.

It can be installed from AUR:

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I use redshift to set the colour temperature on my monitor. It also let you sets the monitor’s backlight

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