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!

Janine

This plugin adds and removes link relations such as nofollow and noreferrer to your external links. Furthermore, indication of external links by adding a custom icon to the link text. This plugin also adds automatically that external links will be opened in a new tab.
<ul>
<li>Add rel=nofollow for all the external links of your posts / pages / menus</li>
<li>Add target=_blank for all the external links of your posts / pages / menus</li>
<li>Exclude domains from addding rel=nofollow for the selected external links</li>
<li>Remove rel=noreferrer for all the external links of your posts / pages</li>
<li>Activate custom icon to indicate external links</li>
<li>Choose from different icons to mark links</li>
<li>Superscript Icon or regular size</li>
<li>Add custom CSS class to icon</li>
</ul>
The plugin is written by Janine, and is based on CyberNetikz Nofollow for external links plugin.

Customize External Links and add Icon

Customize link attributes, such as nofollow links, remove noreferrer, add icons to indicate external links

WP No External Links vs Customize External Links and add Icon