🖥 Control your display's brightness & volume on your Mac as if it was a native Apple Display. Use Apple Keyboard keys or custom shortcuts. Shows the native macOS OSDs.
I just started using this app on my MacBook Pro with an Acer monitor and it's pretty good. Works over DDC as far as I can tell, so now I can use keyboard shortcuts to control the brightness i.e. turn it down a bit at night.
You can read more about it here: https://github.com/MonitorControl/MonitorControl#readme