You could take a look at Jira. I understand most people reading this are probably cringing right now, but the cause of that and what makes Jira appropriate is just how customisable it is. You can setup custom fields, validations, workflows.
While this is probably not a too bad idea, I just can't stop myself lamenting over the customisability of Jira.
Before going bananas with Jira, either be very strict or use separate instances.
I currently work at in a relatively large organisation where all teams of various crafts and trades - not only development - share one Jira instance, since Jira is obviously what 'Agile' teams use.
Let's say that not all teams are equally equipped for analysis and generalisation.
Although there is supposedly some control process, there are now several hundreds of custom fields, many duplicates of the standard fields, and duplicates and triples or more of many custom fields.
The contents of them all are like the dwtf meme: True, False, FileNotFound.
