DeskPins - DeskPins can be used to make any application topmost, that is, to keep it above all other windows.

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.

PinWin - Download PinWin - Pin On Top for free. Pin any window to be always on top of the screen. PinWin is a minimal Windows system tray application that allows you to pin any windows to the top of the screen with one click.

CareUEyes - CareUEyes is an eye protection software for windows that comes with blue light filter, screen dimmer, and break reminder

WindowTop - Easly set any window on top, just move the mouse to the top area of the window.

Dimmer - A very small and free utility for Windows to reduce brightness on LCD/TFT screens.