Linux security defense tools
ArpON (MitM defense tool)
ArpON is a host-based tool to improve the security of the Address Resolution Protocol (ARP).
Fail2ban (log parser and blocking utility)
Fail2Ban is an intrusion prevention software framework that protects computer servers from brute-force attacks
hBlock (ad blocking and tracker/malware protection)
hBlock is a security tool to protect against advertisements, trackers, and malware. It does so by altering the /etc/hosts file and block bad or malicious hosts.
MongoSanitizer (defense against MongoDB injection attacks)
MongoSanitizer is a software component sanitizes MongoDB queries to prevent injection attacks as much as possible.
nixarmor (Linux hardening script)
Nixarmor is a set of shell scripts to harden Linux systems and help with security automation. It configures the system to increase its security level.