Here are some of the tools I have written, maybe you will find usefull:
A Script to calculate cost of CMU Grad School for CMU Employees
Pymon: A Python Script to Monitor a Web Site
netmon.sh: A Shell Script to Monitor Network Usage on Mac OS X
procmon.sh: A Shell Script to Monitor Process Usage on Mac OS X
An Expect script to backup netscreen firewalls
Project:DINO
A network traffic visualization tool
The Garage Monitor 3000 - A system to monitor and alert on door status
How to build the BS2 system and configure the embedded web server.
How to configure the paging system
A shell script wrapper for using rdiff-backup to easily backup a linux box
How to configure spamassassin, dnsbl, and sendmail