THATplugin

Quickly and easily iconize posts, pages, menu items, widget titles, taxonomies, and pretty much everything, using icon picker with plenty of customization options. No shortcodes. No coding skills required. Developer friendly.
Iconize is here to make your life easier, by providing simple and easy to use interface for inserting icons.
Features:
<ul>
<li>8 Optional Icon Fonts included – Dashicons, Font Awesome 4.7, Font Awesome 5 Free (Solid, Regular, Brands), Bootstrap Icons, Foundation 3 Icons and Iconoir</li>
<li>Upload custom fonts</li>
<li>The only actual WYSIWYG icons classic editor plugin (works inside Gutenberg classic editor block)</li>
<li>Menu icons (Customizer support)</li>
<li>Widget title icons (Customizer support)</li>
<li>Post Categories, Post Tags, Custom Taxonomy icons</li>
<li>Effects, color, size, alignment, custom CSS classes options</li>
<li>26 CSS transform options</li>
<li>13 CSS animation options</li>
<li>56 CSS hover effects</li>
<li>Optionally use included fonts inside popular free page builders (Elementor, Beaver Builder, Page Builder by SiteOrigin)</li>
<li>CMB2 Custom field</li>
</ul>
Getting started:
Here’s a link to our <a href="https://thatplugin.com/docs/iconize/" title="Iconize Documentation" rel="nofollow ugc">Documentation</a>, we doubt that you’ll need anything else but feel free to ask if you have any question.

Iconize

Quickly and easily insert icons to posts, pages, menu items, widget titles, taxonomies using icon picker with plenty of customization options

Alex Mills

When adding a page, category, or any hierarchical custom post type or taxonomy to your navigation menu (Appearance → Menus), this plugin allows you to optionally automatically add all descendants (children) of that menu item as submenu items.
In short, you’ll no longer have to manually maintain submenus when you add a new child page to your site.

Add Descendants As Submenu Items

Still works great. Much better than Gecka Submenu - it doesn't break the layout on the menu screen and there's no unnecessary pro version upsell.  I hope this is updated at some point because its age is hiding it from WP's search results.



Works great and it's clean

Automatically all of a nav menu item's descendants as submenu items. Designed for pages but will work with any hierarchical post type or taxonomy …

Iconize vs Add Descendants As Submenu Items