https://bestpractical.com/request-tracker

RT can do all this an more. It’s written in modular perl so it’s super easy to customize if you need to add to it. 5.0 is out and i’ve not messed with it, but it’s a major development it looks like. https://www.youtube.com/watch?v=bnEho2AemX0

I’ve deployed RT and paid them for support before, it’s amazing what 10k a year gets you for support an custom work. Great company.

I like powerdns for an authoritative server.