Logging your support calls since 1999.
I suggest taking a look at GLPI: http://www.glpi-project.org/, which is a long-time fork of IRM.
In the mean time, you can Get IRM on SourceForge. You can also browse Yann's GitWeb repository for IRM and the Bazaar repository from Martin Stevens.
IRM, the Information Resource Manager, is a powerful web-based asset tracking and trouble ticket system built for IT departments and HelpDesks. It keeps detailed information about each computer, as well as providing a trouble ticket system, an FAQ system, and a Knowledgebase. All elements are interwoven into a seamless web application.
For more details, you can contact Yann..