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Redmine comes to mind? Or if you use jira for helpdesk then Request tracker

Also possibly OpenProject, which is an "open core" fork of Redmine

Too late to edit the above, but for anyone curious, here's a year old exchange about a Jira -> OpenProject migration tool:

https://news.ycombinator.com/item?id=42931780

Thanks for the mention. Just to clarify: OpenProject is a fork of Redmine and fully open source, so not open core.

Thanks, but just to confirm, there is a free tier of OpenProject as well as a paid tier with more features. This is often referred to as "open core."

I'm not complaining, as the free tier seems feature rich by itself. Just wanted others to know, especially if this has a chance of changing over time once people have committed to using it.

Reply on news.ycombinator.com