What are some alternatives?
When comparing f.lux and RedshiftGUI, you can also consider the following products
LightBulb - Background application that adjusts screen gamma, making the colors appear warmer at night...
Cygwin - Cygwin is a set of tools that provide Linux and POSIX functionality to Windows.
SunsetScreen - Whether you're a morning lark or night owl, SunsetScreen allows you to set the time of the...
Redshift Color Temperature Adjuster - Redshift adjusts the color temperature according to the position of the sun.
ImageOptim - Faster web pages and apps.
Desktop Dimmer - Enable darker-than-dark dimming for internal and external screens.