Business and Productivity

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.

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Developer: OTRS Team
License: GNU General Public License (GPL)
Operating System: Linux, Unix, Win NT, XP

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.

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Developer: Best Practical Solutions LLC.
License: GNU General Public License (GPL)
Operating System: POSIX