looking for suggestions on a PD work ticketing system to give to ISPs

In my CIX work I have identified the need to provide a public domain or
otherwise freely redistributable work ticketing system. Since many of the
people using this will be ISPs, I thought I would ask this group for any
recommendations that people may have on this,

I hope this message isn't to far afield of what the list is for.

Please send all responses/flames just to me.