XYDAC

This plugin is an Easy to use Taxonomy Manager to Customize Taxonomies and its Custom Fields, with great UI. 
<a href="https://downloads.wordpress.org/plugin/ultimate-taxonomy-manager.zip" rel="nofollow ugc">Download now!</a>.
<a href="http://taxonomymanager.wordpress.com/" rel="nofollow ugc">[Plugin URL]</a> | <a href="https://xydac.wordpress.com/2010/09/30/ultimate-taxonomy-manager-for-wordpress/" rel="nofollow ugc">[Tutorial]</a> | <a href="https://posttypemanager.wordpress.com/" rel="nofollow ugc">[Ultimate Post Type Manager]</a>
[[An upgrade of this plugin is <a href="https://wordpress.org/extend/plugins/ultimate-cms/" rel="ugc">[WordPress Ultimate CMS]</a>, Please upgrade to WordPress Ultimate CMS.]]
Some Features
<ul>
<li>Create Custom Taxonomies.</li>
<li>Customize every detail of Taxonomy.</li>
<li>Create Custom Fields for Taxonomy.</li>
<li>Show Taxonomy as Combobox on New post/Custom Post type page(Provides ability to select only single Taxonomy).</li>
<li>Create same Taxonomy for multiple Post types.</li>
<li>Manage Custom fields for all taxonomies registered (Except Media).</li>
<li>Supports creation of custom fields as Text Box,Combo Box.</li>
<li>Easy to use interface.</li>
<li>Short codes to display custom values wherever you want to display.</li>
<li>Allows Modifying Custom Fields for all Registered Taxonomies even for Category and Post Tags.</li>
</ul>
<h4>Update</h4>
<ul>
<li>Updated to Support View Item</li>
<li>Added Bonus Tweak to Add Default WordPress Categories to Pages.</li>
<li>Added Feature to Select permission based on User Role</li>
<li>Update Count Callback Function Name input for advanced users.</li>
<li>Added Jquery Support</li>
<li>UI Improved</li>
<li>Add Images to any Taxonomy say Category,Post-tags anywhere</li>
<li>UPDATED TO SUPPORT WORDPRESS MULTISITE</li>
<li>Filters shown on Post page</li>
<li>All taxonomies shown on Post page in columns.(Use screen option to customise)</li>
</ul>

Ultimate Taxonomy Manager

This is an Easy to use Plugin to Create, Customize, Manage Taxonomies as well as Manage its Custom Meta Fields. Now add images to category/tags.

rmasfer

Custom Cat plugin will helps to assign taxonomies terms easier than before. You will no longer need to scroll through list of taxonomy terms.
<ul>
<li>A searchable list for assigning terms(e.g. Categories).</li>
<li>Create new terms(e.g. Categories) if no results found.</li>
<li>Supports any type taxonomies.</li>
<li>Hide default Category meta box</li>
<li>Allow only one taxonomy term</li>
</ul>

Ultimate Taxonomy Manager vs Custom Cat