B.10. BTT

Bluetail Ticket Tracker is somewhere between a standard trouble ticket tracker and a bug tracker. It offers privacy features that are somewhat unusual among open-source bug trackers: users of the system are categorized as Staff, Friend, Customer, or Anonymous, and makes more or less data available depending on one's category. It offers some email integration, a command-line interface, and mechanisms for converting emails into tickets. It also has features for maintaining information not associated with any specific ticket, such as internal documentation or FAQs.

http://btt.sourceforge.net/