samwilson

The Embed Wikimedia plugin adds support for embedding photos from Wikimedia projects such as Wikipedia, Wikimedia Commons, and Wikidata.
It requires no configuration, and to use you just add a URL of any of the above sites on its own line in a WordPress post or page.
Development is on Github at <a href="https://github.com/samwilson/embed-wikimedia" rel="nofollow ugc">samwilson/embed-wikimedia</a>; 
please report all issues there.

Embed Wikimedia

The Embed Wikimedia plugin adds support for embedding photos from Wikimedia projects such as Wikipedia.

Mikael Korpela

See today’s Wikimedia Commons picture of the day behind WordPress login screen.
https://commons.wikimedia.org/wiki/Commons:Picture_of_the_day
If you ended up here by searching, you might also be interested in 
pure PHP class which gives you URL of the PotD:
https://github.com/simison/WikimediaCommonsPotd

Wikimedia Commons Picture of The Day for WP Login

See today's Wikimedia Commons picture of the day behind WordPress login screen.

Embed Wikimedia vs Wikimedia Commons Picture of The Day for WP Login