Israel Curtis

This framework is a collection of classes and functions for handling advanced custom post types cases. With just a few defined arrays, it can create custom post types, taxonomies, their labels, menus, metaboxes, and save routines.
NOTE: this began life as an internal development tool, and as such, does not have much (if any documentation) just yet. It’s not really end-user friendly in its current state. So if you’re not running a site I have built for you personally, you probably don’t need it 😉

Somatic Framework

Adds useful classes for getting the most out of Wordpress' advanced CMS features

Mats Westholm

Add one or more Custom Taxonomy to your wordpress managed website.
This plugin is focused on an easy to use interface with small number of choices to make it easier to use for a non technical user.
MW Taxonomy let you choose
<ol>
<li>Taxonomy name in plural and singular,</li>
<li>slug</li>
<li>select the post types (default and custom) where your custom taxonomy can be used</li>
<li>select wheather it should be hierarchical or not</li>
<li>select wherher the taxonomy should be indexed by search engins or not</li>
</ol>
MW Taxonomy includes a widget Custom Taxonomy List for presenting taxonomies in the blog. You need to use a theme that supports widgets for this, that is a classic (non-block) theme. Use the plugin <a href="https://wordpress.org/plugins/classic-widgets/" rel="ugc">Classic Widgets</a> if you don’t find the widget.
Taxonomies can also be presented by Tag Cloud widget or menus (classic theme).
Works in multisite environment as well.
<h4>Docs & Support</h4>
Please ask support questions in the plugin [support forum].(https://wordpress.org/support/plugin/mw-taxonomy)

MW Taxonomy

Easy to use wordpress plugin to add a custom taxonomy

Somatic Framework vs MW Taxonomy