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. Thanks, Jerry