RedshiftGUI!

Ever notice how people texting at night have that eerie blue glow?

LightBulb - Background application that adjusts screen gamma as the day goes, reducing blue light when it gets late

SunsetScreen is a free Windows app (for personal use) which helps take the glare off your your screen in the evening. Scientific research has shown that melatonin - the chemical the brain makes late in the day - is reduced when exposed to blue light. By tempering this blue light, it becomes easier to wind down properly at night, and thus have a more restful sleep.

G.lux is an unofficial variation of F.lux. G.lux is an app that automatically changes the colour temperature of your browser as the sun goes down. Monitors are typically daylight balanced, which can interfere with your sleep cycle when using them after sunset. The human brain wants to be ‘awake’ when it sees daylight, so the idea here is that we can change the screen colour temperature at night to a “tungsten” or orange-balanced colour.

Screen dimming software that allows you to control the brightness of your screens as well as external monitors.

Iris mini is free and minimalistic version of Iris. Small. Minimalistic. Free. Portable. Automatic. Awesome for everyone. Just double click and it will work.

iBrightness Tray is a little bit of a swiss army knife display tool as adjusting the brightness of your screen is just one of three main functions it has. The other two are turning on your screensaver at the click of a button and also the ability to turn off the display completely. This is useful for laptop users when they want save power and switch off the screen for a period of time. Launch the portable executable and click the tray icon to popup the window where you can alter the brightness with the slider or activate the screensaver and screen off options. Right clicking the tray icon gives the extra options to start with Windows and change the default screensaver. »

Enables darker-than-dark Desktop dimming for your displays.

Applies a shade that acts as a dimmer to ensure your eyes don't hurt. Far more powerful than Android's built-in brightness setting. Great for low-light gaming, web browsing, and eBook reading. It even saves battery life for AMOLED displays!

Lux Automatically Adjusts Your Screen Brightness

Turn Off the Lights for Desktop is a powerful, helpful app to dim your whole desktop and protect your eyes at night. Turn Off the Lights for Desktop allows you to work, play in a dark environment without damaging your eyes. And helps you to reduce eye strains and radiation by breaking the brightness limit of your screen settings. The simplicity in this app let’s you dim the screen with one click on the lamp button. And two finger click, you get a quick settings menu to change the color and the opacity value of the dark layer. »

Nocturne is simple app for switching a computer to night vision mode. It has a few tricks up its sleeve: color correction, window shadow toggling, and background removal.