Rest Your Eyes - Prevent eyestrain caused by screens with the 20-20 rule.
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.
Eye Yoga - Improve eyesight, relieve eye strain and prevent presbyopia.
Boomerang Parental Control - Boomerang Parental Control helps parents start conversations with their children's technology use: App Controls, Text Monitoring, Time Limits and more.
Flux - Application Architecture for Building User Interfaces
Qustodio - Free parental control software. Monitor and track your child's online activity. Block dangerous sites and protect kids from online bullying.