What are some alternatives?
When comparing CacheGuard-OS and SSHGuard, you can also consider the following products
Qustodio - Free parental control software. Monitor and track your child's online activity. Block dangerous sites and protect kids from online bullying.
RdpGuard - RdpGuard allows you to protect your Remote Desktop (RDP), POP3, FTP, SMTP, IMAP, MSSQL, MySQL, VoIP/SIP from brute-force attacks by blocking attacker's IP address. Fail2Ban for Windows.
FamilyShield - OpenDNS is the easiest way to make your Internet safer, faster and more reliable. Protect your family across all devices on your home network.
Fail2ban - Intrusion prevention framework
pfSense - pfSense is a free and open source firewall and router that also features unified threat management, load balancing, multi WAN, and more
Denyhosts - The idea of denying access to SSH servers is nothing new and I was inspired by many other scripts...