Eero Hermlin

Native, lightweight, super-fast plugin for updating comments in real-time with Ajax, without need to refresh the page. Allows comments section work interactively like a chatroom. Comments re-classified as trash or spam will be dynamically removed from users screen. It’s pure WordPress plugin, no need for third parties (like Disqus), no paid services, no secondary logins. Perfect alternative to Disqus.
Administrator can choose update frequency, define in what pages realtime comments are used, comments ordering in selected pages. Additionally is possible to set custom walker function (if used theme uses it) and size of avatar.
Supports also paginated view of comments: in this case new top-level comments will be dynamically are added to newest comments page. Nested comments will be dynamically added to parent comments at any comments page.

Realtime Comments

Accepted comments from users are added to pages in real-time, without need to refresh. Makes comments section work interactively, like a chatroom.

Provides real-time notifications of comments through the real-time cloud service Beacon (http://beaconpush.com/). 
Visitors will get real-time notifications when comments are posted to blog posts that they are reading.
<h3>Author</h3>
Created by Jonatan Heyman (http://heyman.info)

Beacon WordPress Plugin

Provides real-time notifications of comments through the real-time cloud service Beacon (http://beaconpush.com/).

Realtime Comments vs Beacon WordPress Plugin