Andrew Nacin

In WordPress 3.5, the Link Manager (which some use to build blogrolls) will 
be disabled by default. If you have links when you update, it’ll still be there. 
But you can use this plugin to ensure it will always be there, even if you 
update to a later version of WordPress or remove all of your current links.

Link Manager

Works on WP 6.1

Enables the Link Manager that existed in WordPress until version 3.5.

jensg

Ultimate Blogroll is a plugin which enables your visitors to submit a linktrade. Your visitors can add their own website and you can keep track of the in- and outlinks.
<pre><code>* Let your visitors add a linktrade
* Give an overview of the linktrades including the stats
* Order by different parameters
* Easily approve or discard a new linktrade
* Check for a reciprocal link
* Prevent spam with Recaptcha
* Import/export links into/from WordPress
* Handy Wizard/Installation process to get you started
* ...
</code></pre>
Now available in: English, Dutch, Spanish, Hungarian, Russian, Norwegian
Credits: 
Spanish translation: Dennis Vera (http://tuguiaweb.net) 
Hungarian translation: Nora Erdelyi (http://locoling-club.com) 
Russian translation: Nickolay Avdeev 
Norwegian translation: Rune Kristoffersen (http://www.sportsmarkedet.com )

Ultimate Blogroll

Enable your visitors to submit a linktrade and keep track of the in and outlinks. It is the ultimate link manager available.

Link Manager vs Ultimate Blogroll