Request Tracker - Perl Ticketing system

PERL: Best Practical - Request Tracker (Enterprise-grade ticketing system)

http://www.bestpractical.com/rt
http://www.bestpractical.com/index.html
http://blog.bestpractical.com/2008/07/today-were-rele.html#screenshots

Dublin bus project - Integrated Ticketing System
http://www.dublinbus.ie/projects/integrated_ticketing_system.asp