Monitor Bright - Monitor Bright reduces with a simple trick the monitor brightness.
Workrave - Workrave is a program that assists in the recovery and prevention of Repetitive Strain Injury (RSI).
PangoBright - Screen dimming software that allows you to control the brightness of your laptop screens as well as external monitors.
Eye Break - eyeBreak is a tiny app designed to sit in the Windows tray and provide a non-ignorable message...
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
StretchMinder - Work break timer with guided movement & breathing exercises