What are some alternatives?
When comparing RedshiftGUI and f.lux, you can also consider the following products
LightBulb - Background application that adjusts screen gamma, making the colors appear warmer at night...
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.
Transmit - Transmit is an FTP client for Mac OS X and Mac OS Classic (which is unsupported).