nicolly

Convert all external links into internal or nofollow links!
This plugin is a fork of the hijacked and vulnarable “WP No External Links” plugin.
The following critical issues have been fixed: 
– Removed Cross-Site Scripting vulnerability. 
– Removed backdoor injected into original plugin. 
– Fixed creation of the new <code>links_stats</code> table: added charset collation and table existence check. 
– Fixed “Specified key was too long; max key length is 767 bytes” error on creating <code>mask_links</code> table. 
– Added removing tables on uninstallation.
No External Links plugin is designed for specialists who care about the number of outgoing links that can be found by search engines. Now you can make all external links internal! Plugin does not change anything in website database – it just processes the output. Now you don’t need to worry about your page rank dropping because of spam bots. You write any kind of http link and it becomes internal, hidden or nofollow! Of course, all the links will still be usable.
To make the long story short, your links like “http://gmail.com” will be masked into 
“http://YourBlog.com/goto/http://gmail.com” – or 
“http://YourBlog.com?goto=http://gmail.com”
<h4>Features</h4>
<ul>
<li>Masking links in posts, pages, comments or on the whole website including widget, theme footer, etc.</li>
<li>Outgoing clicks stats.</li>
<li>Javascript redirect with custom text and timeout.</li>
<li>Masking links with digital code and base64.</li>
<li>Completely removing links from your posts.</li>
<li>Custom redirects.</li>
<li>Disabling masking for registered users.</li>
<li>Disabling masking on per-post basis.</li>
<li>Using nofollow and noindex instead of redirection.</li>
<li>Excluding URLs from masking.</li>
<li>Masking links in custom fields.</li>
<li>Extending plugin with your own functions.</li>
</ul>
If you need any extra features, just create a ticket via support forum.
<h4>Known Issues</h4>
This plugin may conflict with your caching plugins, including Hyper Cache. Usually adding redirect page to caching plugin exclusions works fine.
If you disabled this plugin and still have links masked – check your chaching plugins.

WP No External Links

Convert all external links into internal or nofollow links!

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.

WP No External Links vs Better WordPress External Links