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.

Sound Strategies

This plugin provides complete LinkMgr functionality including link listing, link submission, webmaster contact, and all other features supported by the Sound Strategies LinkMgr.net application
This plugin is intended ONLY for use with the Sound Strategies LinkMgr application (see http://linkmgr.net).
<h3>Advanced</h3>
This plugin can also generate the sitemap entries for the pages generated by LinkMgr. The tag <code></code> must be placed on the page where the site map needs to appear.

Soundst LinkMgr

Displays category and link information from the Sound Strategies LinkMgr application as on-page embedded content and as a widget.

Link Manager vs Soundst LinkMgr