.fay

WP Comments Moderators plugin allows any user (whatever their Role) to moderate any blog comment.
WordPress only allows users with Administrator|Editor role to moderate comments. Those two roles give much more than our need, if you are scared about your blog and dreamed about a lightweight solution, this plugin can be helpful for you.

WP Comments Moderators

WP Comments Moderators plugin allows any user (whatever their Role) to moderate any blog comment.

mikaelnehlsen

A plugin to automatically moderate messages and block those that contain hateful, degrading, or slanderous language. Can be configured for six languages: Swedish. English, Finnish, Danish, Russian and German. To activate the plugin, please go to its settings page and enter an API key for the Gavagai API.

Troll Hunter by Gavagai

A plugin to automatically moderate messages in six different languages and block those that contain hateful, degrading, or slanderous language.

WP Comments Moderators vs Troll Hunter by Gavagai