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Unfortunately that sort of information is not systematically captured anywhere.

Those repsitory names were a legacy of subversion. Where each organization would have one big repository with lots of subprojects. However as our community has moved toward using git. There's a lot more granular source control per repository. Associating multiple repositories together is not done automatically. It would have to be a manual process.

If anything maybe extending something like ROS Index to support cross referencing by author/maintainer would get you a good amount of grouping.