Web-based help desk software using Firebird

Help Desk for IIS is a web-based help desk software solution for delivering customer service and support. It easily installs on your web server as an ISAPI extension for Microsoft Internet Information Services. Your customers or technicians need no additional software other than a web browser. All information is stored in a relational database (Firebird), and the web pages themselves are produced by a server-side ISAPI extension.

More information here.