ControlMyMonitor
Monitor Bright
PangoBright
LG OnScreen Control
CareUEyes
Dimmer
CF.lumen
MinimOther
myPoint Shade
CareUEyes
Dimmer
Red Moon
Lux Auto Brightness
CF.lumen
Eye Saver
MinimOther
ControlMyMonitorMonitor Bright - Monitor Bright reduces with a simple trick the monitor brightness.
CareUEyes - CareUEyes is an eye protection software for windows that comes with blue light filter, screen dimmer, and break reminder
PangoBright - Screen dimming software that allows you to control the brightness of your laptop screens as well as external monitors.
Dimmer - A very small and free utility for Windows to reduce brightness on LCD/TFT screens.
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
Red Moon - Screen filter for night time phone use.