OpenSnitch is a GNU/Linux port of the Little Snitch firewall
Anti Spam SMTP Gateway
Generació regles IPTables per Continents o Països
Tool to ping hosts through firewalls blocking ICMP
track log files, block intrusions, and much more
Firewall Management Script
High interaction honeypot solution for Linux based systems
Lomalarga is a VPN-like service based on SSH and Linux.