ReaSoft Network Firewall is a flexible solution for corporate internet access management and total network defence against any external unwarranted interference.
Arno’s IPTABLES firewall script was initially written because I needed to protect my single-homed Linux machine at work.
Xtables-addons is the proclaimed successor to patch-o-matic(-ng).
A complete firewall, content filter, spam filter, authentication and VPN software system
Network firewall for your Mac.
fwknop implements an authorization scheme that requires only a single encrypted packet to communicate various pieces of info.
An IPv4 Packet Filter with Network Address Translation capabilities.
a linux based firewall distribution with a lot of extras