Apps similar to Lumen include f.lux, which is free. Other options are Redshift, Solace, LightBulb and RedshiftGUI. There's no shortage of Color Temperature Tools like Lumen, with more than 25 alternatives for Windows, Linux, Mac, Android and iPhone.
Synchronize your external monitor brightness with built-in display. Application reads current brightness of your built-in display and passes it to external monitors via DDC interface. You can adjust brightness by menu in system status bar.
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EyeAway is a beautiful, privacy-first macOS app that helps reduce digital eye strain using the proven 20-20-20 rule. Every 20 minutes, look 20 feet away for 20 seconds - your eyes will thank you.
Small GTK GUI application to set contrast, brightness and gamma for wayland compositors which support the wlr-gamma-control protocol extension. Basically this is the example from here: https://github.com/swaywm/wlroots/blob/master/examples/gamma-control.
Away From Keyboard is an app that reduces eye strain with reminders to take a break.
