mustansir

This plugin allows you to add a dashboard widget that manages specific taxonomies (Such as tags and categories or any custom taxonomy). Specifically the dashboard widget makes it easy to remove a post from a taxonomy of any kind.
Those who have themes, plugins, widgets that use the wordpress taxonomy system to place posts in various lists will find this plugin especially useful.
This plugin allows you to add a dashboard widget that manages taxonomies. It easy to remove a taxonomy term applied to a post.

Category Manager

The WP Category Manager plugin makes it easier to manage any taxonomy that is used to control the posts within widgets in the presentation layer

madalin.ungureanu

ReflectionMedia

IMPORTANT: The plugin Custom Taxonomy Creator will no longer be supported or updated.
Custom Taxonomy Creator is now part of <a href="https://wordpress.org/extend/plugins/wck-custom-fields-and-custom-post-types-creator/" title="download link" rel="ugc">WCK – Custom Fields and Custom Post Types Creator plugin</a>, which is fully compatible. <a href="https://wordpress.org/extend/plugins/wck-custom-fields-and-custom-post-types-creator/" title="download link" rel="ugc">Download it</a> and install it instead of the current plugin.
WCK Taxonomy Creator allows you to easily create and edit custom taxonomies for WordPress without any programming knowledge. It provides an UI for most of the arguments of register_taxonomy() function.
Features:
<ul>
<li>Create and edit Custom Taxonomies from the Admin UI</li>
<li>Advanced Labeling Options</li>
<li>Attach the taxonomies to built in or custom post types</li>
</ul>

Custom Taxonomy Creator

With WCK Taxonomy Creator you can create and edit custom taxonomies and attach them to post types.

Category Manager vs Custom Taxonomy Creator