Comment Avalon Management Suite (Score 2, Informative) 80
My company uses the Avalon Management Suite. It's great to use for ticketing, scheduling, inventory, and pretty much everything else we use.
I'm only now looking into what ITIL is, but I'm pretty sure it supports that. Beyond that, it supports the LDAP requirement, it's easy to use, and it has a client login system. We've been very happy with it.
