WP-MediaWiki adds a subset of MediaWiki markups to WordPress. 
Currently, the following MediaWiki markups are supported.
<ul>
<li>Bold</li>
<li>Italic</li>
<li>Heading</li>
<li>Lists: Besides the list markups come from MediaWiki, I also added a continuation markup such that users can put preformatted text in a list item.</li>
<li>Tables</li>
<li>External links</li>
<li>WikiLinks: the wikilink will link to Wikipedia by default, you can change the wiki site in the admin option page.</li>
<li>Table of content</li>
<li>Horizontal line</li>
<li>Preformatted text</li>
</ul>
For more information about MediaWiki markups, please refer to http://meta.wikimedia.org/wiki/Help:Editing. 
For a demo of this plugin, please refer to http://zechs.dyndns.org/wordpress/?page_id=152. 
There is also a sandbox (http://zechs.dyndns.org/wordpress/wp-content/files/wp-mediawiki/sandbox/index.php) for you to preview the effect of this plugin.

WP-MediaWiki

WP-MediaWiki is a plugin for WordPress. It adds a subset of MediaWiki markups to WordPress.

Tyrel Kelsey

Remove empty paragraph tags, and broken paragraph tags caused by shortcodes with content.
<a href="https://github.com/ninnypants/remove-empty-p" rel="nofollow ugc">github</a>

Remove Empty P

Remove empty paragraph tags, and remove broken paragraph tags from around block level elements.

WP-MediaWiki vs Remove Empty P