Nocturne!

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

RedshiftGUI changes the color temperature of your monitor to better match that of your surrounding. This means that it sets a cooler color temperature during the daytime (due to natural lighting) and sets a warmer temperature at night (due to indoor lighting). Similar to f.lux, this is a GUI port of the redshift project.

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.

NegativeScreen is a Windows application allowing you to invert your screen colors.Apart from accessibility matters, this software is especially useful when you are surfing on the internet in a dark room, and the screen is dazzling you.NegativeScreen was designed to work without impacting the performances and fluidity of your computer.Unlike the Windows Magnifier, which is also capable of such color inversion, it was specifically designed to be easy and convenient to use.Different inversion modes are provided, including “smart” modes, allowing blacks and whites inversion, while keeping colors (about) the sames. »

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

Shades is a FREE utility for controlling the brightness of your screen. It runs in the background providing always-available fine-grained control over the brightness of your display via a slick Mac-like interface.