gammastep is described as 'Adjust the color temperature of your screen according to your surroundings. This may help your eyes hurt less if you are working in front of the screen at night' and is a color temperature tool in the os & utilities category. There are more than 50 alternatives to gammastep for a variety of platforms, including Windows, Mac, Linux, Android and Wayland apps. The best gammastep alternative is f.lux, which is free. Other great apps like gammastep are Redshift, Solace, LightBulb and Red Moon.
Trouble Sleeping? Device screen too bright even on the lowest brightness setting? Want to give your phone a warm look instead of that eye straining blue gaze you see at night? EasyEyes is the solution. By changing your device's color temperature, EasyEyes reduces eye strain...
This advanced Windows app allows you to alter the screen shading according to the time of day, which is great if you work outside the normal hours, or if you need a lift in the afternoon. You can set the colour tints and your awake and sleep times.
India
Night Screen is created for those people who spend a lot of time at night working.
Limit your exposure to energy-efficient lighting before bed. In addition to the LED screens in your electronics, energy-efficient lighting emits a lot of blue light.
Setting the color temp of the screen really only requires about 40 lines of C (80 or so all inclusive). sct is a crude utility which does roughly that. I’d say exactly that, but some of the calculations aren’t actually exact.
Shady puts a shade over your screen to help soothe your tired or dazzled eyes. You can use it to reduce your Mac's brightness far below the usual minimum, without any risk of damage to your screen.
United Kingdom
SunshinePal is your daily sunlight companion designed to help you track your exposure, set healthy goals, and reconnect with nature for better sleep and mood.
Thailand
A Python program that calculates ambient brightness and sets screen's correct backlight using a camera.
Lumen - magic auto brightness based on screen contents. You control Lumen simply by using your brightness keys - it'll automatically learn your preferences.
United States
Worlds first Myopic Defocus effect. Applies a Myopic Defocus effect on any website. This makes the screen look on the retina naturally as if it was at a greater distance. People report it being more convenient to look at.
United States
Away From Keyboard is an app that reduces eye strain with reminders to take a break.
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.
