Saul Baizman

This WordPress plugin automagically converts text in the body of your pages whose name corresponds to webpages on your website into links. For example, if you have a webpage entitled “Foo Bar” on your website, when the words “Foo Bar” appear in the text of a page named “Hello World,” the words will automatically be linked to the “Foo Bar” webpage.

Automagicalinks

Automagically convert text to internal links on your website.

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.

Automagicalinks vs Link Manager