Disable comments is a simple plugin for helping WordPress site administrators to disable comments on the whole site.
A very straightforward plugin with a simple goal, this plugin is easy to use.
It can also remove all comment related fields from pages/posts helping keep things tidy and works on Multisite.
This is a must have plugin for anyone with allowing comments on WordPress (not including Disqus).
It is a free (for non-businesses) plugin from the WordPress team which is designed to stop comment spam and keep up with the ever-changing tactics of spammers.
It does a fantastic job and must be installed on any WordPress site.
Note: You need to get an API key from WordPress to enable this service.
Epoch is relatively new and adds some extra POW to the WordPress commenting system.
They aim to provide the following to help with commenting: better user experience, faster loading, native WordPress, Postmatic integration.
If you are looking for some ways to improve the comments on your WordPress site, this may help quite a lot.
If you want to seriously manage the commenting and discussion taking place on your blog, then this is one tool that can help.
Disqus, via their own website, can help you with: commenter authentication, real-time commenting and analytics, social media integration, and more.
By requiring all users to login to comment it severely reduces spam (and sometimes comments too) but also gives a central place and link between comments and users.
It's a tough choice, but some people prefer this to the standard WordPress comments.
Comment Luv is a plugin for those looking to build a community around their blog through their comments section.
It not only provides your commenters with a well-earned link to their latest posts, but also gives them a choice. They also allow other things to be added like the commenter's Twitter handle which helps a lot with networking online.
The plugin also comes with a very powerful anti-spam plugin called G.A.S.P. which has helped reduce my spam in a huge way.
Yoast makes the best plugins, and this one is brand new.
The comment hacks plugins helps WordPress site owners manage comments and interactions with commenters even more easily.
They have provided: email interactions with commenters, redirect commenters to a specific page, cleaner email notifications and much more.
Check it out.