robpannell

From the plugin admin screen you can create rules by specifying a key word or phrase along with an existing 
WordPress category. Th plugin then scans post titles for the key, and adds the specified categories as appropriate. 
By default the plugin will automatically check newly created posts when a page is loaded, however this can be set to manual via a button in the admin screen.
I can’t guarantee any support, but if you use the support forum I will do my best to help you with any issues. 
Feel free to suggest improvements too.

Smart Categories

This simple plugin adds categories to posts based on key words or phrases in the title.

datafeedr

This plugin adds 2 drop down menus to your Media Library (WordPress Admin Area > Media) which enable you to filter the media in your library by the taxonomies and terms (ie. categories) your media is associated with.
Media is generally “attached” to Posts, Pages, Custom Post Types, etc. All these types of posts can be associated with taxonomies and terms. This plugin allows you to filter media which is attached to any type of post by the taxonomies and terms related to those posts.
Plugin inspired by <a href="http://wordpress.stackexchange.com/a/126873" rel="nofollow ugc">answer on StackExchange</a>.
Limitation
The filters are only available when viewing your Media Library in <a href="https://res.cloudinary.com/dpq5gf23t/image/upload/v1699630258/Plugins/list-mode_mobdn5.png" rel="nofollow ugc">“list” mode, not “grid” mode</a>.
<a href="https://res.cloudinary.com/dpq5gf23t/image/upload/v1699630258/Plugins/list-mode_mobdn5.png" rel="nofollow ugc">View screenshot for more explanation</a>.

Media Library Filter

Filter the media in your library by the taxonomies and terms with which they are associated.

Smart Categories vs Media Library Filter