[ay1n]

There is also Redshift [0][1], which I've found easier and simpler to use/install on Linux (but I've researched f.lux long time ago, so things may be different now). I remember that at first I couldn't stand that everything was kind of orangeish, but after a while I honestly didn't notice it anymore. From my personal experience, I can tell that it really made my eyes suffer less from long sessions of copmuter use.

[0] http://jonls.dk/redshift/ [1] https://github.com/jonls/redshift