What are some alternatives?
When comparing SunsetScreen and FireLux, you can also consider the following products
f.lux - f. lux is a piece of software for Windows, Mac, Linux, iOS, and Android that provides a blue light filter over your screen. Research suggests limiting our exposure to blue light in the hours before bedtime can help us fall asleep faster.
CareUEyes - CareUEyes is an eye protection software for windows that comes with blue light filter, screen dimmer, and break reminder
LightBulb - Background application that adjusts screen gamma, making the colors appear warmer at night...
RedshiftGUI - RedshiftGUI changes the color temperature of your monitor to better match that of your surrounding.
Redshift Color Temperature Adjuster - Redshift adjusts the color temperature according to the position of the sun.
Desktop Dimmer - Enable darker-than-dark dimming for internal and external screens.