This page contains some of the software I've written. All of this software is licenced under the GPL.
nav.pl is the perl program which generates the header on most pages on this site.
I've written a daemon to log the data from a temperature logger using Dallas DS1820 sensors, with hardware designed by James Cameron and described here:
You can find source, binaries and more information here.
fwgen is Linux iptables firewall generator. It takes a high-level description of the firewall rules and generates the necessary iptables commands to implement those rules.