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.

Felix Arntz

The plugin adds two taxonomies to the WordPress media library which are then available to categorize and tag your attachments. By default, these taxonomies, although sharing the same names and behavior, are separate from the default post taxonomies, but this can easily be changed if desired.
The plugin follows WordPress Core principles and offers a lightweight alternative to similar approaches which often tend to be incredibly flexible, but at the same time complicated and bloated. And if you have a little knowledge of code, you should be able to adjust the plugin exactly to your needs if the default configuration doesn’t satisfy you.
<h4>Features</h4>
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<li>Adds categories and tags to the Media Library (independent from the regular post categories and tags)</li>
<li>Inserts filter dropdowns for attachment taxonomies into the media toolbar and media modal</li>
<li>Allows to pick taxonomy terms for attachments from within the Attachment Selection & Edit modals</li>
<li>Adds a setting for the default attachment category</li>
<li>Enhances the <code>[gallery]</code> shortcode so that images of a specific attachment taxonomy can be included automatically</li>
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<h4>Quality attributes</h4>
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<li>Lightweight plugin following WordPress Core principles</li>
<li>“Decisions, not Options”</li>
<li>Can easily be used as a must-use plugin</li>
<li>Provides a flexible API to add other attachment taxonomies or disable the existing ones for developers</li>
<li>Provides an easy-to-use <code>has_default</code> argument that can be used when registering an attachment taxonomy in order to automatically add a setting for the default taxonomy term</li>
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Attachment Taxonomies

Works perfect!

Now this is a piece of art!  No bloat, no hassle.  Well done Felix!

Piece of Art

This plugin adds categories and tags to the WordPress media library - lightweight and developer-friendly.

Easy Taxonomy Support vs Attachment Taxonomies