Python is great for building new tools. This page links to some things I've done with Python.
OS-X FTDI USB
Notes for using the FTDI FTD2XX driver from Python in OS-X.
OS-X Login Time
Displays today's total computer use. A Parental Control time remaining indicator.
Last Modified Utility
Updates the modification date in html files.
Based on Peet Brothers Ultimeter 2100
Caller ID paging
Uses a modem to capture CID and email it to a cell phone