Wikipedia でも利用されている Mediawiki

http://www.mediawiki.org/wiki/MediaWiki/ja

# cat .htaccess 
RewriteEngine On
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /index.php [L]

$wgArticlePath = "/$1";
$wgUsePathInfo = true;

$wgGroupPermissions['*' ]['edit'] = false;
$wgGroupPermissions['user' ]['edit'] = true;