blincsystems

Notification Ninja adds a toggle button to your admin dashboard that lets users hide or show admin notices. You can enable automatic hiding by default via the plugin settings. Scripts are properly enqueued using WordPress APIs.

Notification Ninja

A lightweight plugin that allows logged-in users to hide and toggle admin notices with a single button.

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.

Notification Ninja vs bbPress – Notices