yoshitech

Change your admin username to whatever you like. Improve your site security and and make life difficult for the hackers. 
Wordpress default administrator username is admin, which makes the job easier for hackers -they only need to find out the password. 
Now, you can change the default admin username to your liking. No one will know it and that improves your site security greatly.
Misc
<ul>
<li><a href="http://www.kupimito.com" rel="nofollow ugc">Plugin website</a></li>
<li><a href="https://www.paypal.com/cgi-bin/webscr?cmd=_s-xclick&hosted_button_id=SPY83T4ZJM26Y" rel="nofollow ugc">Donate</a></li>
</ul>

Admin username changer

This plugin does not sufficiently check access permissions, nor does it validate the untrusted user input in any way.
In addition, this plugin can easily cause name conflicts with WordPress core code and other plugins, as it uses too generic names for classes and functions.



Various Security Vulnerabilities

Change your admin username to whatever you like. Improve your site security and make life difficult for the hackers.

riotweb

About
Scare hackers off your website with this plugin. When the hacker tries to access important WordPress files he gets redirected to the fbi website. 
Amateur hackers will be easily scared off but the professional hackers are tougher. You can also prank family or friends with this plugin.
Featured files
<ul>
<li>wp-config.php </li>
<li>wp-config-sample.php</li>
<li>xmlrpc.php</li>
<li>license.txt</li>
<li>readme.html</li>
</ul>

Anti Hacker Redirect

Scare off hackers by redirecting them to the FBI.

Admin username changer vs Anti Hacker Redirect