Here are some of the apps and scripts in various languages I've worked on:

*UPDATED January 5, 2010* 
BVN TV program grabber, a PHP script that generates XMLTV formatted XML pages for the Dutch language BVN TV  satellite tv channel. Primarily for use by MythTV or SageTV users. Click the title to download a zip file. Read the README.TXT file for more.
NOTE: in late 2009, BVN changed the format of their web pages containing the programming information. The changes were significant enough that I could not patch the previous Perl grabber. I wrote a new grabber using the PHP language (already installed on most MythTV systems for use by the MythWeb application). This PHP grabber is still very expirimental, but I have been using it succesfully for the past 2 weeks (as of Jan-4-2010)

php Tools for Groupwise, an example PHP management application for the Groupwise collaboration suite. It uses the SOAP api provided by Groupwise v7 & v8. Can manage proxies, rules, folders, create automated reports, and much more. The project can be found at Google Code

Google::ProvisioningAPI, a perl module implementing the Google Apps for Your Domain Provisioning API version 1 (Update: someone else has now updated this module to include supported for v2 of the API! Above link goes to that version.)

JNOS - a multitasking app written in C (with some x86 assembly), running on DOS, for Hamradio use. Provides TCP/IP services of Packet Radio. For more, see http://www.qsl.net/wg7j   This is now actively developed as JNOS2, running under Linux, at www.langelaar.net/projects/jnos2/)