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.
dupeGuru - dupeGuru is a tool for finding duplicate files on your computer.
CareUEyes - CareUEyes is an eye protection software for windows that comes with blue light filter, screen dimmer, and break reminder
AllDup - AllDup is a freeware tool for searching and removing file duplicates on your Windows computer.
Dimmer - A very small and free utility for Windows to reduce brightness on LCD/TFT screens.
Czkawka - Multi functional app to find duplicates, empty folders, similar images etc.