Nice tool! Similar tool, different approach

[J-u-n-o]

Created a similar tool myself, though with a different approach:
Two slider for contrast and brightness to control all monitors. And also synchronize the changes made on the external monitor using the monitor keys, or laptop keyboard for the internal monitor.
It is using a calibration/mapping table to compensate for different monitor characteristics. These can be changed using the GUI and a graph.
All nicely written in python and QT. Detects (un)plugging monitors.
Known issue: system resume requires restarting of the tool, and the setup should use tabpages instead of a 'scrolling' widget (information; brightness; contrast)
Curious about your opinion.
https://github.com/J-u-n-o/MonitorControl