@bnrstnr said in Trying to find a good, on-premises, multi-department help desk application:
Looks like Zammad does both SSO and Groups (Departments). I don't use it though, so no experience there...
I have this deployed locally. It can be multi-department, but it is, obviously, geared toward IT more then anything else. It can do LDAP and SAML auth and have the ability to integrate with pretty much anything.
It's also stupid easy to install. The big complaint I have at the moment is that some of the customization that I wanted to do needed to be done in the backend.