SPIN Safe Browser - SPIN Safe Browser is a free web filter that blocks porn and inappropriate content to provide a safe internet surfing experience for kids.

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.

Boomerang Parental Control - Boomerang Parental Control helps parents start conversations with their children's technology use: App Controls, Text Monitoring, Time Limits and more.

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

Qustodio - Free parental control software. Monitor and track your child's online activity. Block dangerous sites and protect kids from online bullying.

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