Nikolay N.

<p>Simple plugin that will improve your onsite SEO a bit and make all links from the comment section dofollow, if they point to your own domain. Other links that point to external websites will remain nofollow. WP DoFollow Comment Links don’t have any configorations – simply activate it and that’s all.</p>
<p>It also works with WordPress installations that reside in a subfolder. For example, WordPress installed in example.com/blog, separate from the main website example.com.</p>
<p>If you have any questions or suggestion, hit me up… nnikolaev [at] sematigo.co.uk</p>


WP DoFollow Comment Links

The plugin automatically makes all the comment links to your own domain dofollow, while all external links remain nofollow.

LukaszWiecek

<p>The “Smart DoFollow” plugins lets you automatically give DoFollow links to authors of comments that are longer than a given number of chars. You can reward the authors of long comments with strong links that have SEO-value.</p>
<h4>My other plugins</h4>
<ul>
<li><a href="https://wordpress.org/extend/plugins/social-slider/" title="Social Slider" rel="ugc">Social Slider</a></li>
<li><a href="https://wordpress.org/extend/plugins/socialfit/" title="Social Fit" rel="ugc">Social Fit</a></li>
<li><a href="http://commentify.info/" title="Commentify" rel="nofollow ugc">Commentify</a></li>
<li><a href="https://wordpress.org/extend/plugins/thank-you/" title="Thank You" rel="ugc">Thank You</a></li>
</ul>
<h4>Translations</h4>
<ul>
<li>English – <a href="http://tomasz.topa.pl" title="Tomasz Topa" rel="nofollow ugc">Tomasz Topa</a></li>
<li>Polish – <a href="http://mydiy.pl" title="Łukasz Więcek" rel="nofollow ugc">Łukasz Więcek</a></li>
</ul>


Smart DoFollow

The "Smart DoFollow" plugins lets you automatically give DoFollow links to authors of comments that are longer than a given number of chars.

WP DoFollow Comment Links vs Smart DoFollow