Lynis home page: https://cisofy.com/lynis/ How Lynis and auditd are different: https://linux-audit.com/how-are-auditd-and-lynis-different/ OpenVAS home page: http://www.openvas.org/ Snort home page: https://www.snort.org/ Nikto home page: https://cirt.net/nikto2 Security Onion home page: https://securityonion.net/