I has suggested this before but trying it's again.
The CowTicket is a tool there can be used as ticket system. It updated often and got more and more option.
I self used it as support site but also a application tool and it is good to both. I only wish I could use Softaculos to update ir and so on.
You can see there support site where you also can dawnload a copy of it here: http://ticket.cowscript.dk/ticket/index.php?view=front