Not a single open source solution in the bunch.

Whenever I have some money I think I'll wip one up.

Although to make it super hardcore, I might just make the whole thing a rest API first. You're responsible for logging in via something like postman or insomnia, and then you need to send in your own rest request to update your tickets. I would do this to encourage a true engineering first mindset.

Then I'm going to open source the whole thing MIT. JSON based project management.