Haldaug

<p>This plugin creates a widget that displays excerpts from Wikipedia on the tag pages (the template tag.php). The user can specify multiple languages for the plugin to query using the Wikipeida API. The language that has an article that matches the tag has its article displayed.</p>
<h3>Credits</h3>
<p>This widget is based on the WordPress-Wikipedia-Widget by patlockley: <a href="https://github.com/patlockley/WordPress-Wikipedia-Widget" rel="nofollow ugc">WordPress-Wikipedia-Widget</a></p>


Wikipedia for tag pages

A widget that displays excerpts from Wikipedia articles relevant to the tag on tag-pages. Support for multiple languages.

eduardosada

<p>WikiLink WordPress plugin is an easier way to link to Wikipedia. Allows you to see a Wikipedia definition but without leaving your blog.</p>
<h4>Licence</h4>
<p>This plugins is released under the MIT, you can use it free of charge on your personal or commercial blog.</p>


Wikipedia for tag pages vs WikiLink