PHP ticketing system + vBulletin

Is there a good php ticketing system such as kayako eSupport and DeskPro that integrates with vBulletin nicely?

Kayako and DeskPro are too costly for the business at the moment.

Solution

I have read some stuff in the past about OTRS, might look into that. Also a quick Google search found these:

OSTicket
SimpleTicket

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