More in the firewall vein; here's a tool to help you build your firewall rules, by far the most complicated part of using a firewall - fwbuilder. It supports ipfw out of the box, and also purports to support ipfilter. Gotta get started on this trip myself.
Description for ports/security/fwbuilder
A note by Phil Payne on using fwbuilder:
One quirk, when using fwbuilder with IPFW, the divert to natd isn't
supported so I'm installing the rules with a little script that inserts the
natd rule appropriately.
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#!/bin/sh.fw # Installs the rules generated by fwbuilder
ipfw delete 1 # delete the check-state rule at 00001
ipfw add 1 divert natd ip from any to any via# add new
divert rule at 1
ipfw add 2 check-state # re-add the check-state 2
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