Erick Hitter

Oomph, Inc.

Allows users to point WordPress objects (posts, pages, custom post types) to a URL of their choosing, which is particularly useful for injecting non-WordPress content into loops. The object appears normally in any loop output, but visitors to the object will be redirected to the specified URL. The plugin also allows you to choose the type of redirect, either temporary (302), or permanent (301).
Through a filter, the External Permalinks Redux meta box can easily be added to custom post types. There is also a function available for use with WordPress’ <code>add_meta_box</code> function.
This plugin was originally written for use on WordPress.com VIP. It is inspired by and backwards-compatible with Mark Jaquith’s Page Links To plugin, meaning users can switch between plugins without risk of losing any existing external links.
This plugin is translation-ready.

External Permalinks Redux

Allows you to point WordPress objects (posts, pages, custom post types) to a URL of your choosing.

yonifre

pshitik

This Plugin gives you the option to replace any post on the site with an external article by replacing its link on an archive page to the external link. The link will open in a new tab. 
All you have to do is edit a post and enter the external link that will replace it.
What\’s included?
<ul>
<li>Redirect to those who go directly to the post to the external link</li>
<li>The link opens a new tab</li>
</ul>

Lenix Post External Link

This Plugin gives you the option to replace any post on the site with an external article by replacing its link on an archive page to the external lin …

External Permalinks Redux vs Lenix Post External Link