Jorge A. Gonzalez

Easy External Links is a SEO friendly, external link handler for WordPress.
The current aim of Easy External Links is to standardize the format of external links and create consistent on-page SEO.
<a href="http://watchworthy.io/underwater-base-jumping/" rel="nofollow ugc">Demo</a> | <a href="https://s.w.org/plugins/wp-links/screenshot-1.png" rel="nofollow ugc">Options</a>
<h3>Features</h3>
<ul>
<li>Open external links in a new tab or current tab</li>
<li>Domain Filtering</li>
<li>Show icon next to external link (100 icons to chose from) </li>
<li>External image hosting support</li>
<li>Add rel=”external nofollow” to external links</li>
<li>Add title attribute to external links (uses to the text of the link)</li>
<li>Add target=”_blank” to comment links (rel=”external nofollow” coming soon) </li>
<li>Add target=”_blank” to external links in excerpts</li>
</ul>

Easy External Links

Install, activate, configure, forget. Works really well!

As simple and as good as it gets

Take control of external links in WordPress posts, pages & comments. Insert rel=external nofollow and target=_blank to all your external links.

rrolfe

The CLM plugin allows wordpress admins to have more control over the links left by users who leave 
comments on their blogs. Admins are provided with the ability to remove all author links from comments 
unless the user has made an admin specified number of comments. You are also provided with the ability 
to override that setting with whitelist and blacklist features. The full list of features provided by 
the CLM plugin is below
Features
<ul>
<li>Enables admins to remove nofollow attribute from comment author links</li>
<li>Allows for optional removal of nofollow attribute from links left in the body of comments</li>
<li>Provides admins with the ability to open comment author and body links in a new browser window.</li>
<li>Provides ability for admins to require a specified number of comments before enabling comment author links</li>
<li>Has built in whitelist and blacklist functions to override general setting of required number of comments</li>
</ul>

Comment Link Manager

CLM enables admins to disable author links, open links in new window, and remove the nofollow tag from links that are left in comments by visitors.

Easy External Links vs Comment Link Manager