Rene Maurer

This plugin show the current versions from WordPress | PHP | Theme | Webserver | MySQL in the Backend Dashboard footer.
<ul>
<li>WordPress version installed</li>
<li>PHP version from your Hoster</li>
<li>Theme and Child Theme</li>
<li>Web Server from your Hoster</li>
<li>MySQL version from your Hoster</li>
</ul>

WP Server & Theme Info

Show the current versions from WordPress | PHP | Theme | Webserver | MySQL in the Backend Dashboard footer.

Andrew Norcross

Liquid Web

mallardduck

Do you run your WordPress in a Cluster based setup? 
Ever need to know what server your request came from? 
Don’t want to have to dig into server access logs to do it?
Look no further, this is just the plugin you’re looking for.
Hello Server adds a menu-node to the Admin Toolbar that tells you what server your request was sent from! In the new Hello Server menu you’ll find the current servers hostname and IP!

Hello Server by Liquid Web

This is a simple plugin that tells you what server your WordPress is running on. It's super useful for when you run WordPress in a clustered, or  …

WP Server & Theme Info vs Hello Server by Liquid Web