OpenSnitch is a GNU/Linux port of the Little Snitch firewall
Next Generation Open Source Firewall
Add rule to windows firewall to block inbound and outbound traffic
Generació regles IPTables per Continents o Països
Anti Spam SMTP Gateway
Tool to ping hosts through firewalls blocking ICMP
Program to block League of Legends contacts.
Bypass your ISP's firewalls and connect to the internet!
360-FAAR Analyze FW1 Cisco Netscreen Policy Offline Using Config/Logs
track log files, block intrusions, and much more
Open source voucher management / hotspot system
Linux firewall distribution geared towards home and SOHO users.
Programmable completion code (bash) for ipset (netfilter.org)
High interaction honeypot solution for Linux based systems
Jateway is a general purpose TCP/IP connection proxy
network control and reporting
KnockIt! is a port Knocking tool for MAC OSX
a secure, open source OS for use inside USEagency facilities
Firewall/Proxy FreeBSD