Ruuttu

This is a tiny plugin that simply re-enables breadcrumbs for BuddyPress group forums. Enable the plugin, enable the breadcrumbs. Simple.
Make sure you’re using the latest BuddyPress and bbPress.

Group Forum Crumbs

Yudhistira Mauris

This plugin helps you create a series of posts. It creates a new taxonomy named ‘series’ (can be modified via filter, see FAQ). There is no setting needed for this plugin. Once it is installed, assign posts you want to group as a series via post editor.
The plugin also creates a posts navigation on posts that belong to a certain series. See screenshots for the examples.

Easy Post Series

Works beautifully and doesn't have a sucking frontend design, as other similar plugins do!

Group Forum Crumbs vs Easy Post Series