It is probably a good idea to mention what Redshift actually is, since it’s far from the top result in a search, and a lot of people associate that word with an AWS product by the same name. Wikipedia describes the Redshift you presumably mean as:

an application that adjusts the computer display’s color temperature based upon the time of day.

It also mentions that gammastep is a more recent fork, but it has not had any commit activity for 2.5 years, so gammastep might be abandoned as well.