The CUJO smart firewall looks friendly, but gets mean when defending networks from hackers and malware, including ransomware. It protects everything from PCs to baby monitors by analyzing each device and using machine learning to resolve problems. An app lets users monitor the network or limit a child's Internet time. CUJO is $99 with an $8.99 monthly or $108 annual monitoring plan or $249 with a free lifetime plan. CLICK THE PIC FOR MORE INFO.