ScreenTime - Show your macOS desktop on FaceTime
Qustodio - Free parental control software. Monitor and track your child's online activity. Block dangerous sites and protect kids from online bullying.
RescueTime - Time management software that shows you how you spend your time & provides tools to help you be more productive.
Norton Family - Symantec provides security products and solutions to protect small, medium, and enterprise businesses from advanced threats, malware, and other cyber attacks.
LeechBlock - LeechBlock is an extension for Firefox and Chrome that allows users to block time-wasting sites.
NxFilter - Best performance. You don't want to slow down your network by installing a network security software. NxFilter is a light-weight DNS filter. It doesn't cause any latency issue in your network.