denishua

When a reply is made to a comment the user has left on the blog, an e-mail shall be sent to the user to notify him of the reply. This will allow the users to follow up the comment and expand the conversation if desired. 
Detail information: http://theme10.com/comment-reply-notification/
中文介绍： http://fairyfish.net/2008/11/03/comment-reply-notification/

Comment Reply Notification

When a reply is made to a comment the user has left on the blog, an e-mail shall be sent to the user to notify him of the reply.

quan_flo

Make bbPress more user friendly…
You know the problem? You post a new topic or a new reply to an existing topic but you forgot to subscribe to the topic?
You will not get any email with other members replies.
This plugin ..
<ul>
<li>per default sets the initial state of the “subscribe to topic” checkbox for each user to checked</li>
<li>will save the state of the checkbox for “new topics” and “new replies” via ajax.</li>
<li>will make your bbPress users more happy! 😉</li>
</ul>
More about me and my plugins
Since the year 1999 I do administration, customizing and programming for several forums, communities and social networks. In the year 2013 I switched from another PHP framework to WordPress. 
Because not all plugins I’d like to have exist already I wrote some own plugins and I think I’ll continue to do so.
If you have the scope at forums or social networks my other modules might also be interesting for you. <a href="https://wordpress.org/plugins/search.php?q=quan_flo" title="ifs-net / quan_flo WordPress Plugins" rel="ugc">Just take a look at my WordPress Profile to see all my Plugins.</a> Use them and if my work helps you to save time, earn money or just makes you happy feel free to donate – Thanks. The donation link can be found at the right sidebar next to this text.

bbPress auto subscribe for new topics and replies

Automatically checks the subscription checkbox for new bbpress topics or bbpress replies and saves the last state via ajax for each user and for new t …

Comment Reply Notification vs bbPress auto subscribe for new topics and replies