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Tracrss provides a module and a page that allow multiple Trac servers (http://trac.edgewall.org/) to be queried for a list of open tickets. We use a separate trac for each of our projects and I was finding that people do not check for tickets in old projects. In this module the administrator can define any number of trac servers to check and then users provide their login in details and can open tickets on those servers will be displayed.
The 6th incarnation of Elmer's blog