ChimiDev Server Information plugin allows you to see more information about Wordpress and server where it installed.

WP Tech Lookup plugin is to see all the necessary information about server at one place.

This plugin is intended for theme developers to use. It shows the current template being used to render the page, current post type, and much more.

Web Server Information plugin will give you detailed information about your hosting server's configuration and installed modules.

Allows you to send server information via email.

Easily monitor your server by watching your server usage and resources with three widgets.