WikipeDPLA by Eric Phetteplace.
From the webpage:
See relevant results from the Digital Public Library of America on any Wikipedia article. This extension queries the DPLA each time you visit a Wikipedia article, using the article’s title, redirects, and categories to find relevant items. If you click a link at the top of the article, it loads in a series of links to the items. The original code behind WikiDPLA was written at LibHack, a hackathon at the American Library Association’s 2014 Midwinter Meeting in Philadelphia: http://www.libhack.org/.
Wikipedia:The Wikipedia Library/WikipeDPLA
How you resolve the topic map versus mashup question depends on how much precision you expect from a topic map. While knowing additional places to search is useful, I never have a problem with assembling more materials than can be read in the time allowed. On the other hand, some people may need more prompting than others, so I can’t say that general references are out of bounds.
Assuming you were maintaining data sets with locally unique identifiers, using a modification of this script to query an index of all local scripts (say Pig scripts) to discover other scripts using the same data could be quite useful.
BTW, you need to have a Wikipedia account and be logged in for the extension to work. Or at least that was my experience.
Enjoy!