Ridham

New Tab Redirect Plus will allow you to have your comment visitors links open in a new tab or window. In other words, instead of leaving your site completely when clicked, they will open in a new tab.
This plugin opens all the web links added in the footer comments URL, in a new tab or window which helps to decrease the bounce rate and increase user engagement on your wordpress blog.
Opens all the Web site links (URLs) added in the comments and author URL, in a new tab or window.
This will increase the likelihood that visitors will continue browsing your website.
Simple, fast, and effective!
<h4>Some of the features include:</h4>
*Open comment links in a new tab or the same tab 
*change a custom link’s destination with a redirect 
*Open WordPress Comment Links in New Tab/Window (add target=”_blank”) 
*Replace URL INTO Your Custom web URL 
*Works with http:// and https:// links 
*Simple, fast, and effective!

New Tab Redirect Plus

Stop any fake data sending visitors away - By default, Open WordPress Comment Links in New Tab/Window (add target=”_blank”) tab or window with: New Ta …

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.

New Tab Redirect Plus vs Comment Link Manager