ELsMystERy

Easy Taxonomy Support, by <a href="http://spectrumvisions.com" title="Spectrum Visions" rel="nofollow ugc">Spectrum Visions</a>, makes it easy to add post tag and category support to pages and custom post types.
Custom post type support will prevent post tags and categories that are associated with custom posts from returning “nothing found”, or 404 errors. With the page tags and/or categories enabled, you can add tags to pages and assign pages to categories.
<h3>Show the Love</h3>
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Features
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Add tags and categories to WordPress pages.
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Allows tags on custom post types with the “post_tag” taxonomy to function without producing errors.
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Page tags will show up in your tag cloud.
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Interacts with <a href="https://wordpress.org/plugins/q-and-a-focus-plus-faq/" title="Q & A Focus Plus FAQ" rel="ugc">Q & A Focus Plus FAQ</a> so that tags on FAQs are not broken if Easy Taxonomy Support is deactivated.
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Easy Taxonomy Support does not:
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Add the “post_tag” or any category taxonomies to registered custom post types. Custom post type support only works if you can already add tags to custom posts.
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Display categories or tags at the bottom of pages.
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Clean your house, mow your lawn, or improve your love life. If we can add these features in the future, we will.
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Easy Taxonomy Support

Use post tags and categories with pages and custom post types.

Matteo Enna

My Wine Repository

Taxonomy Meta Box Filter enhances the WordPress admin interface by adding a simple search field above each taxonomy metabox. 
It supports default taxonomies (like categories and tags), as well as custom taxonomies and custom post types (CPTs).
Perfect for sites with a large number of terms, allowing you to quickly find and select the ones you need while editing posts.
<h3>Features</h3>
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<li>Search field added to every taxonomy metabox</li>
<li>Works with hierarchical (categories) and non-hierarchical (tags) taxonomies</li>
<li>Compatible with custom taxonomies and CPTs</li>
<li>Script only loads on the <code>post</code> and <code>post-new</code> admin screens</li>
<li>Fully translatable</li>
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<h3>License</h3>
This plugin is licensed under the GNU General Public License v2 or later.

Taxonomy Meta Box Filter – Search taxonomies from the editor

Adds a search field above each taxonomy metabox in the post editor, making it easier to manage categories, tags, and custom taxonomies.

Easy Taxonomy Support vs Taxonomy Meta Box Filter – Search taxonomies from the editor