Apache – The unofficial WordPress Plugin Directory

Show Apache and PHP version

Turn Query String Parameters into file revision numbers.

Adds a dashboard widget displaying server specs like current PHP version.

Apache server-info and server-status monitoring right in your WordPress admin.

Prevent virtual directory listing services from listing the contents of directories, and/or show a page in place of a directory's listing.

The smallest cache plugin ever released (but still greatly efficient).

PageSpeed Module plugin supports WordPress installation under Apache or Nginx with PageSpeed Module.

This plugin makes it possible to override php settings.

SpiderBlocker will block most common bots that consume bandwidth and slow down your blog.

Manage 301 redirects, track 404 errors, and improve your site. No knowledge of Apache or Nginx required.