Allows you to display a captcha on your comment form to avoid spam.
Add license terms to your comment form.
Allow OpenID based commenters to add their thoughts via comments on your WordPress blog. This plugin is not an OpenID server.
Easily separate comments from trackbacks and pingbacks
Ajaxify commenting with the MooTools JS Framework- mootools.net
Allows readers to choose the comment sort order and allows for filtering of Trackbacks/Pingbacks.
The plugin will show the top first commentors (the numner is number is set by user) of your blog.
INAP uses AJAX to replace excerpts with the full posts, paginate posts, load comments and submit comments. Comes with a extremely powerful Admin Panel
Unique Comment Notify appends the author's name to subject of notification e-mails.
Removes the comment author URL if it contains any of the specified words.
AdServe is the advertising server for WordPress. You could setup your banner campaigns
using different sized banners, set available impressions and co
This plugin will allow you to remove an unwanted author-URI entered by a commenter with one single click of your mouse.
Allows you to paste code into comments or posts by surrounding it in `backticks`, just like in the WordPress.org support forums.
Send automated email to your blog's commenters everytime you reply their comments on the blog's comment system.
This plugin allows commenter to remove their comment author details from the comment form.
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