Tom Belknap

The ultimate auto-tagging plugin for WordPress.
NOTE: The plugin is now being maintained on GitHub, so please do contribute all your questions, comments, suggestions, fixes and improvements with me <a href="https://github.com/holisticnetworking/title-to-terms" rel="nofollow ugc">here</a>.
Title to Terms Ultimate is for every WordPress admin that needs tags, categories and other taxonomies filled out automatically. For each post type in your WordPress installation, T2TU will allow you to assign a taxonomy to be automatically updated with keywords pulled from the title of the post.
Every time a post gets saved or updated, T2TU analyzes the title of the post for usable keywords. A list of user-configurable “Stop Words” is checked by the parser, so that words like “I” or “going” don’t get made into ultimately useless tags.
<ul>
<li>Converts keywords in post titles to terms in any taxonomy</li>
<li>Includes user-editable list of words to be ignored.</li>
<li>Ignore list can be reset to default at any time.</li>
<li>Converts on save, not publish.</li>
<li>Configurable to either add new terms or append the list of terms.</li>
</ul>
Multisite admins take note: this plugin is especially helpful if you’re building a community-based site where tagging is important and your bloggers are not always diligent about tagging.
<h3>Acknowledgements</h3>
<ul>
<li>The WP Plugin Repository icon and banner were both made with the kind contribution of: <a href="https://thenounproject.com/search/?q=taxonomy&i=165760" rel="nofollow ugc">Muharrem Fevzi Çelik @ The Noun Project</a> (CC licensed)</li>
</ul>

Title to Terms Ultimate

The ultimate auto-tagging plugin for WordPress.

Dominik Schwind

Enables a widget with the category description. This is useful if the theme you are using is not showing 
this information.
Works on tags and other taxonomies as well.

Category Description Widget

Enables a widget with the category description.

Title to Terms Ultimate vs Category Description Widget