Request Tracker

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Request Tracker (RT) is the system you need to track the important tasks you can't afford to forget.   The open-source enterprise grade self-hosted (or cloud hosted) ticketing system 

Demo preview:

he source code and API are completely open! You are free to customize RT and integrate with other systems and tools. You also aren’t locked into a vendor and you never need to worry about paying for software licenses.

requesttracker.io

 Software is used by GNU/Linux Debian