dmikam

This simple plugin permits you to upload images to categories, tags and custom taxonomies just like to posts. 
This feature is very useful when you want to show unique image in header tor every category or even some slideshow of images. 
Also you can show a list of categories/subcategories with a little thumbnail am much more.
By the way, this plugin just uses wordpress native functionality – no aditional tables and nothing like that. 
Also it uses wordpress images so all sizes are generated automatically (custom sizes included).

WP Category Images

Simple plugin that permits to images to Categories, Tags and Custom Taxonomies.

Javier Villanueva

Post Category Filter allows you to filter through your post categories and custom taxonomies by adding a search box on top of the term lists. The lists will update live as you type with only the relevant results based on your search query.
<h4>Want to contribute?</h4>
You can follow the <a href="https://github.com/jahvi/post-category-filter" rel="nofollow ugc">Github repository</a> and submit issues or pull requests.

Post Category Filter

Filter post categories and taxonomies live in the WordPress admin area

WP Category Images vs Post Category Filter