SandyRig

Sort topic replies in ascending or descending order for each bbPress Topic. You can choose to save setting for each topic, for the whole Forum or set globally for every Topic.
<h4>Features</h4>
<ul>
<li>Sort Replies</li>
<li>Show leading topic(Original Post) at the top of each page</li>
</ul>
Adds a simple options on the Forum and Topic side bar to choose. If you want the replies to any topic, or all the topics in the selected Forum to be sorted in Ascending or Descending order.
bbPress default sorting order is Ascending order. This means the latest reply shows on the last page. Some people want the latest replies to show on the first pages. If that person is you, this plugin is for you.
Settings priority applies in following order: Topic>Forum>Global 
Filter looks for the settings for each topic starting at the topic level. If settings not found at the Topic level, it looks for settings for the Forum the Topic belongs to. If nothing found there either, it applies the global settings. What this means is that you can fully customize sort setting for each forum and topic.

bbPress – Sort topic replies

Sort topic replies in ascending or descending order for each bbPress Topic.

jstnlngls

This was built out of a need for a way to bring registered users into a conversation unfolding in comments on posts. I work with an art collective and we’re all posting multiple posts on multiple topics and as we’ve tried to shift more and more of our conversations out of email and onto our website, there didn’t seem to be an easy way to bring specific people into these comment conversations without using a more general comment notification plugin. Notify Tagged User attempts to change that.
This plugin would help out any multi author blogs, and in particular, teams or project blogs that focus on internal communication.
Basically the plugin works by using the familiar Twitter @user reply syntax in the following way: 
-check all new comments for the @user syntax 
-if tagged users are found, look through the database for registered users’ nicknames matching the tagged user 
-if a registered user’s nickname is found, get the associated email address 
-send an email to all users tagged asking them to join in on the conversation

Tagged User Notification

This plugin allows you to tag other registered users on your blog in a comment in order to bring them into a conversation they might otherwise be miss …

bbPress – Sort topic replies vs Tagged User Notification