http://www.troubleticketexpress.com/
FREE trouble ticket software
"Use this CGI script on your web site for everything from bug tracking and customer support to project management and to-do lists. Creating a trouble ticket is now as easy as submitting a web form, while the help desk software assigns unique number to each service request and saves it in the database to review at any time. Truly scalable solution: start with a plain text database, upgrade to the industry-strength MySQL or Microsoft SQL Server engine as your needs grow."