Open-source help desk software has been popping around in the last few years. If you want feature-rich and mature open-source help desk software, look first at RT or OTRS. Much other help desk software exists for smaller or defect-tracking-oriented needs. Just try to identify the open-source help desk software you need by carefully reviewing the features. Usually, the installation process of this kind of software is pretty straightforward, give them a try.
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