1. Disqus Comment System — WordPress Plugins
The Disqus comment system replaces your WordPress comment system with your comments hosted and powered by Disqus.
Disqus, pronounced "discuss", is a service and tool for web comments and discussions. Disqus makes commenting easier and more interactive, while connecting websites and commenters across a thriving discussion community.
The Disqus for WordPress plugin seamlessly integrates using the Disqus API and by syncing with WordPress comments.
Disqus for WordPress
Uses the Disqus API
Comments indexable by search engines (SEO-friendly)
Support for importing existing comments
Auto-sync (backup) of comments with Disqus and WordPress database
Disqus Features
Threaded comments and replies
Notifications and reply by email
Subscribe and RSS options
Aggregated comments and social mentions
Powerful moderation and admin tools
Full spam filtering, blacklists and whitelists
Support for Disqus community widgets
Connected with a large discussion community
Increased exposure and readership
2. WP Advanced Comment — WordPress Plugins
WP Advanced Comment is a powerful and easy to use AJAX based comment system for wordpress with drag and drop fields that allows your website visitors to comment on articles, blogs and product pages.
Main Features ( Free Version )
1. Easy to create forms with drag and drop options.
2. Enable or disable guest comments.
3. Change comment forms status to published, unpublished or show only comments( disable comment form ).
4. Email notification of new comments with custom fields.
5. Advance search comments ( Backend ).
6. Uses of Jquery Validation plugin.
7. Available custom fields ( Text, Textarea, Radio Button, Checkbox, DropDown/Select, Multiselect, Url, Email, Setion Break, HTML Codes , User Image )
8. Create unlimited custom fields.
9. Create unlimited comment forms.
10. Options to show custom fields to admin only ( frontend ).
11. Ajax Pagination on Comments
12. Automatically approved the comments without moderation option.
13. Notification to admin and users.
14. User roles will be displayed on the comments. eg. administrator, author, subscriber etc.
15. Report to admin if the comment is inappropriate.
16. Comments can be unpublished automatically when there are many flags for a comment.
17. It supports WPML.
18. Recent Comments widgets with three differest styles.
3. Comments Evolved for WordPress — WordPress Plugins
Comments Evolved ( formerly Google+ Comments for WordPress ) makes the comment section tabbed seamlessly adding tabs for G+ Comments, Facebook, Disqus, WordPress Comments, and Trackbacks
If a user is required to create an account with your site before they can comment, you might as well ask them to fetch you a soda from mars. It’s probably not going to happen. However, if you can give them the option to comment with an account they’ve already set up, then you will be much more likely to get some interaction.
4. Comments — Tags — WordPress Plugins
Also Check and Use Other Wordpress Comments Plugin 2017. Like,
Akismet
Disable Comments
WP-Optimize
Broken Link Checker