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osTicket
The osTicket open source ticketing system official project repository, for versions 1.8 and later
GLPI (https://glpi-project.org/) or osTicket (https://osticket.com/) are open source ticketing systems but I highly doubt they're what a MSP need. You need a PSA.
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SaaSHub
SaaSHub - Software Alternatives and Reviews. SaaSHub helps you find the best software and product alternatives
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GLPI
GLPI is a Free Asset and IT Management Software package, Data center management, ITIL Service Desk, licenses tracking and software auditing.
GLPI (https://glpi-project.org/) or osTicket (https://osticket.com/) are open source ticketing systems but I highly doubt they're what a MSP need. You need a PSA.
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https://zammad.org/ it cery customizable and has a fsitly good documentation