Yevhen Horbyshyn

This plugin adds a hidden “inverted” checkbox to your forms to prevent bots from submitting them.
<ul>
<li>Adds support for Contact Form 7 via shortcode <code>[ica_checkbox]</code></li>
<li>Adds JavaScript-based hidden checkbox to regular forms in the footer</li>
<li>Blocks form submission if the checkbox is unchecked or missing (typical behavior for bots)</li>
</ul>

Inverted Checkbox Antispam

Simple spam protection using an inverted checkbox. Compatible with Contact Form 7 and custom HTML forms.

WPKube

The plugin restores the <code>Title</code> field (that was removed from WordPress 4.2) in the insert link popup box and adds a new <code>Add rel="nofollow" to link</code> checkbox to it.
Gutengerg (Block Editor) Note: At the moment it’s not possible to add the functionality to Gutenberg, it’s a different system from the classic editor and it does not have a hook/filter which allows adding custom settings. As soon as it becomes possible to add the functionality to Gutenberg we will update the plugin.
This plugin has been adopted and maintained by <a href="https://www.wpkube.com/" rel="nofollow ugc">WPKube</a>, a popular WordPress resource site, where you can find guides on <a href="https://www.wpkube.com/category/wordpress-plugins/" rel="nofollow ugc">WordPress plugins</a>, <a href="https://www.wpkube.com/best-wordpress-hosting/" rel="nofollow ugc">WordPress Hosting</a>, and more.

Title and Nofollow For Links (Classic Editor)

I just installed this on WP 4.9, and it works like a charm. I ended up adding HTML Class manipulation as well, by coping the code in the JS file that added the title field.

Works Well

works with wp 5.2.1

Helpful tool

The plugin adds a title and a rel="nofollow" checkbox to the insert link popup box. Only for Classic Editor, NOT Block Editor.

Inverted Checkbox Antispam vs Title and Nofollow For Links (Classic Editor)