nDPI VS FamilyShield

netifyd - The open source netifyd engine performs deep packet inspection and analysis on network traffic.

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

libprotoident - Libprotoident is a library that performs application layer protocol identification for flows.

Norton Family - Symantec provides security products and solutions to protect small, medium, and enterprise businesses from advanced threats, malware, and other cyber attacks.

L7 Filter - ClearFoundation is a developer community for ClearOS, a Linux Internet Network, Gateway and Server for small business and distributed networks.

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.