CareUEyes - CareUEyes is an eye protection software for windows that comes with blue light filter, screen dimmer, and break reminder
Monitor Bright - Monitor Bright reduces with a simple trick the monitor brightness.
Dimmer - A very small and free utility for Windows to reduce brightness on LCD/TFT screens.
PangoBright - Screen dimming software that allows you to control the brightness of your laptop screens as well as external monitors.
CF.lumen - CF.lumen is a powerful app for Android that adjusts the colors by detecting the position of the sun or according to custom settings.
LG OnScreen Control - Allows to set the brightness (and other settings) of the monitor through DDC/CI. Meaning: keyboard and/mouse instead of having to fiddle with the OSD menu manually. http://www.lg.com/us/support/monitors