WP Link Analysis

Comment Probation allows you to require moderation for a future comment by a comment author, rather than having the comment be automatically approved.

Plugin tool for assembling lists of IP addresses, emails, and URLs from spam comments.

FV Thoughtful Comments adds front end comment moderation including sophisticated banning mechanisms. Say Goodbye to Disqus!

Notify users other than the admin that new comments or new post have been posted or created

A lightweight plugin that globally disables comments and pings across all WordPress content - past and future.