Skyy

This plugin allows you to banned certain username from making comment, particularly when you don’t want to ban 
ip addresses, but want to stop certain “notorious” misbehaving users.
If your blog requires user registration, you should really try the “members.0.1.1” wordpress plugin.

WP-Ban-User

OutsourcingVN

Major features of this plugin include 
* Add text before or after current post title 
* Select category, tag or taxonomy to change

OutsourcingVN Change category name

Major features of this plugin include * Add text before or after current post title * Select category, tag or taxonomy to change

WP-Ban-User vs OutsourcingVN Change category name