Thrive Comments is a commenting system for a WordPress site. The plugin does not connect the commenting service, but improves and complements the existing commenting system on the site.
Demo: https://thrivethemes.com/comments/
CommentPress is a small but powerful plugin for wordpress that allows you to insert, edit and delete commentsfast and easy.
Demo: https://codecanyon.net/item/commentpress-ajax-comments-insert-edit-and-delete-comments-for-wp/4542951
The progressive component Komento Pro will allow your site visitors to leave comments on the articles, blogs or products that they like on the pages of the Internet resource.
Demo: http://demo.stackideas.com/komento