Andrew Nacin

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


Link Manager

Works on WP 6.1

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

lzw.

<p>A plug-in can enable all classic functions, and also contains some practical functions</p>
<ol>
<li>Register hierarchical posts to build documents</li>
<li>Enable Link Manager</li>
<li>Enable Classic Editor</li>
<li>Enable Classic Widgets</li>
<li>Gravatar Mirror Server</li>
<li>In archive and home page display the post excerpt</li>
<li>Password protected posts only the content after <code><--more--></code> require password</li>
<li>Use vuejs and <code><div class="html-demo"></div></code> to preview html code</li>
<li>Img Src Prefix, like a CDN</li>
<li>Enable Login Limit</li>
<li>Enable SMTP Email</li>
<li>Highlight Style</li>
</ol>


ClassicPlus To Enable Classic Functions

A plug-in can enable all classic functions, and also contains some practical functions

Link Manager vs ClassicPlus To Enable Classic Functions