applications/system

• clamav - Anti-virus software
• clamav-milter - The Clam AntiVirus sendmail-milter Daemon
• hydra - Very fast network log-on cracker
• hydra-frontend - The GTK+ front end for hydra
• lynis - Security and system auditing tool.
• nipper - nipper
• ossec-hids - An Open Source Host-based Intrusion Detection System
• sysdig - sysdig