Niraj Chauhan

<p>This plugin will help the user to add a drop-down-custom-taxonomy box with the help of small code on his desired location.</p>
<h4>Options</h4>
<p>just place this small code into your theme file and the drop-down box will appear on that page<br />
code:<br />
for example, if you want to display it on home page,<br />
then navigate to index.php, the inside that put this code, if you want to display the custom taxonomies, then just replace  category with your custom taxonomy name.</p>


Drop-down-taxonomy

This plugin will help the user to add a drop-down-custom-taxonomy box with the help of small code on his desired location.

Sabuj Kundu

codeboxr

<p>Custom Taxonomy Filter in WordPress Admin Panel Post Listing Plugin will solve or help to add custom taxonomy filter/dropdown for built-in or custom post type listing in Admin panel or dashboard.</p>
<h3>CBX Custom Taxonomy Filter by <a href="http://codeboxr.com/product/custom-taxonomy-filter-in-wordpress-admin-post-listing" rel="nofollow ugc">Codeboxr</a></h3>
<blockquote>
<p>📋 <a href="http://codeboxr.com/product/custom-taxonomy-filter-in-wordpress-admin-post-listing" rel="nofollow ugc">Documentation</a> | 👨‍💻 <a href="https://wordpress.org/support/plugin/custom-taxonomy-filter/" rel="ugc">Free Support</a> | 🤴 <a href="https://codeboxr.com/product/customization-support/" rel="nofollow ugc">Pro Support</a> | 📱 <a href="https://codeboxr.com/contact-us/" rel="nofollow ugc">Contact</a></p>
</blockquote>
<p>Features:</p>
<ul>
<li>Supports all post types including built-in and custom post types</li>
<li>Supports all taxonomy including custom and built-in taxonomy types</li>
<li>Enable/Disable for any post type</li>
<li>Enable/Disable any taxonomy</li>
</ul>


CBX Custom Taxonomy Filter

UI is nice enough, but it didn't work properly for mee, and support orum seems inactive. Support thread:
https://wordpress.org/support/topic/does-not-work-with-custom-taxonomy?replies=1



Not great

This plugin adds custom taxonomy filter in wordpress admin post listing panel as per setting

Drop-down-taxonomy vs CBX Custom Taxonomy Filter