Firewall
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Fwbuilder is a unique graphical firewall tool that allows the user to create objects and then drag and drop those objects into firewalls, to build a powerful security system for a single PC or a network of PCs. Fwbuilder supports a wide range of firewalls (Cisco ASA/PIX, Linux iptables, FreeBSD's ipfilter, OpenBSD's pf , and more), so its rules can be deployed on multiple platforms. Let's take a look at using Fwbuilder on Linux, which might just become a life-long affair with a powerful security system. Installation of Fwbuilder is as simple as searching for "fwbuilder" (no quotes) in your Add/Remove Software tool (such as Package-Kit, Synaptic, etc) and marking Fwbuilder for installation.
Build Powerful Linux Firewalls with Firewall Builder
FreeBSD firewalls using PF (Tutorial) By Click Death Squad (C.D.S.)
FreeBSD firewall using PF - clickdeathsquad
pfsense
