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

Pau Iglesias

The process to creating a post is not just writing, most of the time you need categorize, assign tags, etc.
But how are you sure of the quality of assignments? Too many categories? Missing tags in some posts?
This plugin allows you to detect these entries defining operations related to the number of terms.
Also have full support for custom post types and custom taxonomies.

Entries By Terms Count

The process to creating a post is not just writing, most of the time you need categorize, assign tags, etc.

Category Manager vs Entries By Terms Count