OpenSnitch is a GNU/Linux port of the Little Snitch firewall
Anti Spam SMTP Gateway
Add rule to windows firewall to block inbound and outbound traffic
Generació regles IPTables per Continents o Països
Tool to ping hosts through firewalls blocking ICMP
Program to block League of Legends contacts.
track log files, block intrusions, and much more
High interaction honeypot solution for Linux based systems
a secure, open source OS for use inside USEagency facilities
Firewall/Proxy FreeBSD
Managing OpenBSD's Packet Filter with Python