Needed: Global Database Database

There should be a website that provides a link to each known global database.  One example of a global database would be a global listing of parts available for purchase.  Another would be a universal basic biography website.  A Google search (for e.g., “global database”) could work, if it wouldn’t also turn up so many other pages that are not global databases in this sense.  The basic purpose would be to provide a quick start into a search for anything that should be listed in a global database.