Source: https://github.com/tiredofit/docker-freescout
Source: https://github.com/freescout-help-desk/freescout
Very simple ticket system. Works off of an email inbox but better than a shared mailbox. Can pay for more features like time tracking, client portal to submit tickets, dark mode, etc.
https://git.je/Alex/freescout/wiki/Connect-FreeScout-to-Microsoft-365-Exchange-via-OAuth