WebTechee

Smart External Links Manager detects external links in post content and adds:
<ul>
<li>target=”_blank”</li>
<li>rel=”noopener noreferrer”</li>
</ul>
Internal links, anchor links, mailto, and tel links are ignored. 
This plugin is intentionally lightweight and works out of the box without configuration.

Webtechee External Links Security

Automatically adds secure attributes to external links in post content.

Khang Minh

This plugin gives you total control over external links on your website. This plugin also comes with a comprehensive domain filtering feature. BWP External Links is based on the popular Prime Links phpBB mod by Ken F. Innes IV (Prime Halo).
Demo
If you want to see this plugin in action, you can either visit <a href="http://betterwp.net" rel="nofollow ugc">Better WordPress</a> or <a href="http://wordpress.grc.nasa.gov" rel="nofollow ugc">a user’s website</a> (NASA Glenn Research Center’s Website).
Tutorials
Check out this <a href="http://betterwp.net/wordpress-tips/redirect-external-links/" rel="nofollow ugc">redirect external links tutorial</a> for some tips on how to set up a redirection/disclaimer page using BWP External Links.
Some Features
<ul>
<li>Process links for post contents, comment text, text widgets, or the whole page</li>
<li>Domain filtering:
<ul>
<li>You can specify which sub-domains of your website to consider local (all subdomains, no subdomain, or some)</li>
<li>You can specify which external domains to consider local</li>
<li>You can forbid certain external domains (e.g. pron.com or warez.com) and replace URLs linking to them with a URL of choice (useful for filtering links in visitors’ comments)</li>
<li>Wildcard support, e.g. <code>*.example.com</code>, <code>*.subdomain.example.com</code></li>
</ul>
</li>
<li>You can add <code>rel="external"</code>, <code>rel="nofollow"</code> or any custom relation tag you could think of to external links</li>
<li>You can specify CSS classes for both local and external links, as well as external image links</li>
<li>You can use provided CSS rules (an external icon is added to each external link) or define your own</li>
<li>Choose whether or not to open a completely new window for each external link</li>
<li>Choose between three ‘new window’ modes: <code>onclick</code> attribute, <code>target</code> attribute or jQuery</li>
<li>Add a prefix to external links. Example use would be a redirection page that warns your visitors about the danger of visiting external sites, e.g. <code>http://yourdomain.com/out?</code></li>
<li>WordPress Multi-site compatible</li>
<li>And more…</li>
</ul>
It is highly recommended that you give the <a href="http://betterwp.net/wordpress-plugins/bwp-external-links/#usage" rel="nofollow ugc">Official Documentation</a> a good read to make the most out of BWP External Links.
Please don’t forget to rate this plugin <a href="https://wordpress.org/support/view/plugin-reviews/bwp-external-links?filter=5" rel="ugc">5 shining stars</a> if you like it, thanks!
Get in touch
<ul>
<li>Support is provided via <a href="http://betterwp.net/community/" rel="nofollow ugc">BetterWP.net Community</a>.</li>
<li>You can also follow me on <a href="http://twitter.com/0dd0ne0ut" rel="nofollow ugc">Twitter</a>.</li>
<li>Check out <a href="http://feeds.feedburner.com/BetterWPnet" rel="nofollow ugc">latest WordPress Tips and Ideas</a> from BetterWP.net.</li>
</ul>
Languages
<ul>
<li>English – default</li>
<li>Danish – Danske (da_DK) – Thanks to <a href="http://runit.nu" rel="nofollow ugc">Randi</a>!</li>
<li>Malaysian (ms_MY) – Thanks to <a href="http://d4rkcry3r.com/" rel="nofollow ugc">d4rkcry3r</a>!</li>
<li>Dutch (nl_NL) – Thanks to Juliette!</li>
<li>Serbo-Croatian (sr_RS) – Thanks to <a href="http://www.webhostinghub.com" rel="nofollow ugc">Web Hosting Hub</a>!</li>
</ul>
Please <a href="http://betterwp.net/wordpress-tips/create-pot-file-using-poedit/" rel="nofollow ugc">help translate</a> this plugin!
Visit <a href="http://betterwp.net/wordpress-plugins/bwp-external-links/" rel="nofollow ugc">Plugin’s Official Page</a> for more information!

Better WordPress External Links

Gives you total control over external links on your website.

Webtechee External Links Security vs Better WordPress External Links