f.lux - f. lux is a piece of software for Windows, Mac, Linux, iOS, and Android that provides a blue light filter over your screen. Research suggests limiting our exposure to blue light in the hours before bedtime can help us fall asleep faster.
DisplayFusion - DisplayFusion will make your multi-monitor life much easier.
CareUEyes - CareUEyes is an eye protection software for windows that comes with blue light filter, screen dimmer, and break reminder
WindowGrid - Quickly and easily layout windows on a dynamic grid using just the mouse.
Dimmer - A very small and free utility for Windows to reduce brightness on LCD/TFT screens.
Mizage Divvy - Divvy is an entirely new way of managing your workspace.