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.

voceplatforms

Jeff Stieler

csloisel

This plugin adds Menus themselves as an item you can put in other Menus as placeholders representing their contents.
When a Menu containing other Menus as items is rendered, the “submenu” item is expanded out into all of its items.

Voce Submenu Items

Nest menus as items to avoid giant navigation menus in your admin.

bbPress Threaded Replies vs Voce Submenu Items