TIgor4eg

This plugin adds widget to dashboard with such information:
<ul>
<li>
Time wgen Yandex crawler last accessed your site
</li>
<li>
Does site have dangerous code
</li>
</ul>
All information is provided by <a href="http://webmaster.yandex.ru/" rel="nofollow ugc">Yandex Webmaster</a> and showed as is. You should be registred Yandex user and add your site in Yandex Webmaster Service.

Yandex Webmaster

This plugin shows information from Yandex Webmaster.

Paul Bearne

This is a simple tool that helps you provide the site verification code and file generator for any service that needs to verify the site 
via a comment / meta in the head section or via a file URL.
This is a generic site certification tool. 
To use it, just add the plug-in and turn it on as needed. 
You will no longer need to FTP a file to the site root or add extra tags to the header.php in the template to enable your site to be verified by third-party services.
Some examples: 
Google webmaster tool needs a file called googleXXXXXXXXXXXXX.html with no contents. 
OR 
<meta name=”google-site-verification” content=”XXXXXXXXXXXXXXXXXXXXXXXXXXXXX” /> in the HTML head, 
Without this plugin, you would have to create a file and FTP it to your server or edit your template. With the plugin, you can generate the verification method needed automatically via the control panel.
Similarly, Trustwave SSL wants a file called cert.html with the contents of 
“Trustwave SSL Validation Page”

WP Site Verification tool

A tool to enable verification of site ownership via file or meta tag.

Yandex Webmaster vs WP Site Verification tool