Julian Yanover

Check comments for duplicate content using Google AJAX Search API as they are published. This helps to avoid having duplicate content in your posts. It only checks approved comments that have over 50 words. The plugin searches two random strings, both 8 words length. If one of them finds an exact match, it emails you letting you know so you can check it yourself and decide if you want to delete it.

No Duplicate Content in Comments

Check comments for duplicate content using Google AJAX Search API as they are published. Emails you whenever it finds a match so you can check it and  …

DesignSmoke

<h3>Advanced Spintax Post Generator – Spintax Plugin for WordPress</h3>
Advanced Spintax Post Generator allows you to quickly create posts using your spintax templates.
Create multiple locations, events, posts and pages without duplicate content penalties using this free WordPress spintax plugin. For example, if you have multiple stores that all offer the same products, you can quickly create unique pages for each one.
This is a completely free (GPLv2) plugin created by <a href="https://www.designsmoke.com/" rel="nofollow ugc">DesignSmoke – Portland Web Development</a>
Features
<ul>
<li>Avoid Duplicate Content Penalties</li>
<li>Spin titles, descriptions, slugs, tags and categories</li>
<li>Supports all custom post types</li>
<li>
Create as many posts as you want
</li>
<li>
(Future release) Create templates for easy re-use
</li>
<li>(Future release) Featured images</li>
<li>(Future release) Create posts for each keyword in a list (EG: Store San Diego, Store Dallas, Store New York City)</li>
</ul>
FAQ
<ul>
<li>Can I modify this plugin?</li>
<li>Yes! The plugin is <a href="http://www.gnu.org/licenses/gpl-2.0.html" rel="nofollow ugc">licensed under the GPLv2 License</a>.</li>
</ul>

Advanced Spintax Post Generator

Advanced Spintax Post Generator - Spintax Plugin for WordPress

No Duplicate Content in Comments vs Advanced Spintax Post Generator