OTRS - Helpdesk platform in Perl
OTRS is the leading open-source service innovation suite and includes Help Desk, an ITIL-compatible IT service management (ITSM) solution, an iPhone App and an underlying technology platform. It provides web interface to administer and manage the tickets. Email notifications will be sent out for new tickets and follow-ups.
Output of reports could be saved as PDF format. It has support for multiple databases. Full text search is provided to search the tickets. LDAP authentication support is available. There are lot more features available with this product. It has more than 80,000 installations around the world. OTRS Group offers global consulting, customization and support services.