MaikelM

Manage and display links on a WordPress site. Plugin uses custom types, so exporting is very easy. 
To display links in a post or page use the following short tags:
[links cat=”name of category”]
[SHOWLINKS] for displaying all links
A simple option to export links per category is possible using the overview screen: 
Click “All Link Items” -> Click on the link Category you want to export -> [OPTIONAL, but recommended] Select “Title” to alphabetize your export list -> Select “Bulk actions” and chose the Export to xHTML -> Click “Apply” Now you can save you selection. Use pandoc.org to convert your selection to markdown or another format if needed.
This Plugin has a “broken link” check functionality. 
The Broken checks can take a while with a significant number of links. The screen stays blanc during progress. note: No progress bar is shown.
See https://www.bm-support.org/innovation-links/ for a live demo.
How does it work? 
This module makes use of Custom Post Types with non hierarchical catalogue option. So you can give links one or multiple tags. 
Tags works great for retrieving or exporting only certain types of links. 
If all tags for a link are deleted, the link still exist. This is default WP functionality. Since this plugin in built on using default wordpress hooks, 
exporting and importing links can be done used as with post or pages.

Simple Link Library

Manage your link collection in a simple way.

John James Jacoby

Stuttter

Add categories to media & attachments.
<h4>Main Features</h4>
<ul>
<li>Control media categories the same way as post categories.</li>
<li>Filter the Media Library by category, in both the list and grid views.</li>
</ul>
<h4>Also checkout</h4>
<ul>
<li><a href="https://wordpress.org/plugins/wp-chosen/" title="Make long, unwieldy select boxes much more user-friendly." rel="ugc">WP Chosen</a></li>
<li><a href="https://wordpress.org/plugins/wp-term-order/" title="Sort taxonomy terms, your way." rel="ugc">WP Term Order</a></li>
<li><a href="https://wordpress.org/plugins/wp-term-authors/" title="Authors for categories, tags, and other taxonomy terms." rel="ugc">WP Term Authors</a></li>
<li><a href="https://wordpress.org/plugins/wp-term-colors/" title="Pretty colors for categories, tags, and other taxonomy terms." rel="ugc">WP Term Colors</a></li>
<li><a href="https://wordpress.org/plugins/wp-term-icons/" title="Pretty icons for categories, tags, and other taxonomy terms." rel="ugc">WP Term Icons</a></li>
<li><a href="https://wordpress.org/plugins/wp-term-visibility/" title="Visibilities for categories, tags, and other taxonomy terms." rel="ugc">WP Term Visibility</a></li>
<li><a href="https://wordpress.org/plugins/wp-user-groups/" title="Group users together with taxonomies & terms." rel="ugc">WP User Groups</a></li>
<li><a href="https://wordpress.org/plugins/wp-user-activity/" title="The best way to log activity in WordPress." rel="ugc">WP User Activity</a></li>
<li><a href="https://wordpress.org/plugins/wp-user-avatars/" title="Allow users to upload avatars or choose them from your media library." rel="ugc">WP User Avatars</a></li>
<li><a href="https://wordpress.org/plugins/wp-user-profiles/" title="A sophisticated way to edit users in WordPress." rel="ugc">WP User Profiles</a></li>
<li><a href="https://wordpress.org/plugins/wp-user-signups/" title="A sophisticated way to edit users in WordPress." rel="ugc">WP User Signups</a></li>
</ul>

WP Media Categories

Everything about this plugin feels native to WordPress. Filtering your view within the Media Library works exactly how you would expect if you're familiar with filtering posts by category. I also appreciate that the terms are stored in the database in a way that is consistent with all other taxonomies. Great plugin with a singular purpose.



Simple, elegant solution for media management

As a proof of concept it does work, but user has type categories manually upon file upload and there is no category filtering in media insertion dialog, which kind'a would be the point of having categories.

When you need media "folders", like for images or photos, this is the plugin. Works out of the box.

Let's a developer add tax queries, as for post. Then very powerful.

Simple Link Library vs WP Media Categories