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.

Piotr Pesta

<p>Wikipedia Anniversaries is a widget that lets your visitors to see important history dates from Wikipedia. Supported languages so far: Deutsch, Polish, English and Persian. More languages in the future. To customize style just edit style-wiki-this-day.css file. Cache support – 5 hours refresh rate.</p>
<p>If you would like to show your support for this software, please consider donating: <a href="https://www.paypal.com/cgi-bin/webscr?cmd=_s-xclick&hosted_button_id=EEDF5TV3M2WVG&lc=US" rel="nofollow ugc">Donate via PayPal</a>.</p>


Wikipedia Anniversaries

Wikipedia Anniversaries is a widget that lets your visitors to see important history dates from Wikipedia.

Wikipedia for tag pages vs Wikipedia Anniversaries