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.

rob1n

Got a bug report or want to contribute? Please do so on the <a href="https://github.com/robinadr/parsedown-wp/issues" rel="nofollow ugc">GitHub issue tracker</a> or <a href="https://github.com/robinadr/parsedown-wp/pulls" rel="nofollow ugc">submit a pull request</a>.
<a href="http://parsedown.org" rel="nofollow ugc">Parsedown</a> is an efficient, modern PHP implementation of the <a href="http://daringfireball.net/projects/markdown/" rel="nofollow ugc">Markdown</a> syntax originally developed by John Gruber. This plugin runs your posts and comments through the <a href="https://github.com/erusev/parsedown-extra" rel="nofollow ugc">Parsedown Extra</a> version, which has additional features that are part of the <a href="https://michelf.ca/projects/php-markdown/extra/" rel="nofollow ugc">Markdown Extra</a> extension by Michel Fortin.
Michel wrote the <a href="https://michelf.ca/projects/php-markdown/classic/" rel="nofollow ugc">original Markdown plugin for WordPress</a>, and this aims to be a 100% compatible drop-in replacement for that. Michel’s original plugin is no longer supported as of February 1, 2014.
So why Parsedown? It’s <a href="http://parsedown.org/speed" rel="nofollow ugc">faster</a>, <a href="http://parsedown.org/consistency" rel="nofollow ugc">more consistent</a> and is being <a href="https://github.com/erusev/parsedown" rel="nofollow ugc">actively developed</a>.
Development of this WordPress plugin <a href="https://github.com/robinadr/parsedown-wp" rel="nofollow ugc">takes place over on GitHub</a>. If you have any support requests, I do monitor the support forums on here, or you can <a href="http://robinadr.com/contact" rel="nofollow ugc">contact me directly</a>.

Parsedown for WordPress

I really love Parsedown, I created a web app with it recently to host Markdown files on my server. I was really impressed with Parsedown's speed. This plugin is exactly what I was looking for, so I could store my posts as Markdown in WordPress yet display them as HTML on the front-end.

Love this plugin

This plugin processes your posts and comments using the Parsedown library. It is a direct replacement for PHP Markdown Extra by Michel Fortin.

WP-MediaWiki vs Parsedown for WordPress