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What about pukiwiki?

PukiWiki is most popular wiki system in Japan. Please read: http://pukiwiki.sourceforge.jp/?About%20PukiWiki

How do I add a pukiwiki plugin?

This plugin includes original pukiwiki 1.4.7. You can add a pukiwiki plugin to /wp-content/plugins/pukiwiki-for-wordpress/svn/pukiwiki/plugin.

I would like to modify stylesheet

This plugin convert html into

element. Please add style (ex. .pukiwiki_content h1 {...}) to your css file in theme. And you should override style on `/wp-content/plugins/pukiwiki-for-wordpress/pukiwiki.css'.