f.lux - I Like!

Staring at multiple computer monitors late into the night isn't as pleasant as it should be. I've noticed that the constant bright glare from the monitors causes a lot of fatigue. f.lux is a very simple and yet highly effective tool that has made coding so much more pleasant. I very highly recommend this to anyone who spends long hours working at a computer. Available for Mac, PC and Linux. (PS: MacBooks already have similar functionality built-in that uses the integrated camera to detect ambient light and adjust brightness accordingly).