OTRS is an Open source Ticket Request System (also well known as trouble ticket system) with many features to manage customer telephone calls and e-mails. The system is built to allow support, sales, pre-sales, billing, internal IT, helpdesk, etc. departments to react quickly to inbound inquiries. credativ supports OTRS on Linux, Windows, AIX, Mac OSX and Solaris.
Request Tracker or 'RT' is an enterprise-grade ticketing system which enables a group of people to intelligently and efficiently manage tasks, issues, and requests submitted by a community of users.RT is built using Perl and runs on Apache web server with data stored in MySQL, PostgreSQL, Oracle or SQLite. It is possible to extend the RT interface using plug-ins written in Perl.