I need a support/ticket plugin.....however...

Hi,
I am looking for a system to set up a support / ticket system that doesn’t require people to have to sign up and log in, nor go to the admin panel to submit tickets.
I want to end up with a ticket/support page that visitors can submit a ticket and intern automatically automatically set up an account.
Please correct me if I am wrong, but it appears that the WPMUDev support plugin works in the admin panel.
some thing like freshdesk.com would be cool but I need it within out site. I guess what I am trying to say is I need a system that works in the front end.
Any suggestions on where to look.

Many thanks
Andrew