Pippin Williamson

This add-on plugin for bbPress will allow you to place forum-wide notices for alerting your users to important information, such as delayed response times, operating hours, new features, etc.
If you have suggestions or bugfixes for the plugin, please report them on <a href="https://github.com/pippinsplugins/bbPress-Notices" rel="nofollow ugc">Github</a>.

bbPress – Notices

An extension for bbPress to easily show notices at the top of all forum pages.

Stephen Edgar

A simple bbPress extension to customize the email sent to forum & topic subscribers when a new topic or reply is posted.
Once activated, you will have two new options in Settings > Forums that will let you configure the email and subject to your liking.

bbPress Custom Reply Notifications

A simple bbPress extension to customize the email sent to forum & topic subscribers when a new topic or reply is posted.

bbPress – Notices vs bbPress Custom Reply Notifications