Radek Mezulanik

<p>This plugin:</p>
<ol>
<li>
<p>Add 3 hidden fields to Registration form and to Comments form, that only robots can see. Plus you can choose to add validation checkbox to forms.</p>
</li>
<li>
<p>Add to .htaccess file direct access protection for comments file.</p>
</li>
<li>
<p>Check time user spent on page and time when user send a form.</p>
</li>
<li>
<p>Disable trackbacks for past and future posts.</p>
</li>
</ol>
<p>Additionally you can choose to add validation checkbox to forms.</p>


Antispam Revolution

Three way antispam protection for registration and comment forms.

Jake Jackson

<p>If you like total control of the comments on your WordPress blog without having any extra overheads (like you get with 3rd party spam prevention software) then this is a great tool for you.</p>
<h4>Features</h4>
<ul>
<li>Automatically placed IP address on comments blacklist if administrator marks comment as spam</li>
<li>Will remove IP address from comments blacklist if spam item is marked as ‘not spam’</li>
<li>When activated, will review all spam comments and place the spammers IP address on the comments blacklist.</li>
</ul>
<h4>Support</h4>
<p><a href="http://www.blueliquiddesigns.com.au/index.php/wp-automatic-spam-blacklister/" rel="nofollow ugc">All support is provided through the plugin developer’s website</a>.</p>


WP Spam Blacklister

The WP Spam Blacklister is a simple spam-prevention plugin that adds the IP address of a marked spam post on Wordpress' comments blacklist.

Antispam Revolution vs WP Spam Blacklister