Jennifer M. Dodd

bbPress Threaded Replies is based on comment-display functions from WordPress 
and topic-display functions from bbPress. Settings can be adjusted on the bbPress 
Forums options page of WordPress. bbPress running as a WordPress plugin is required.
bbPress Threaded Replies is incompatible with the Fancy Editor; enabling threading will 
automatically disable the Fancy Editor.
The plugin checks first in the stylesheet and template directories before reverting 
to the default plugin templates.
<h3>Credits</h3>
Development funded, in part, by Ariel Meadow Stallings and the Offbeat Empire.

bbPress Threaded Replies

Add threaded (nested) reply functionality to bbPress.

adamschoenemann

Usage
Simply install and then find the widget in Appearance->Widgets

Collapsible Pages Widget

Wordpress plugin that provides a widget that lists pages in a collapsible list

bbPress Threaded Replies vs Collapsible Pages Widget