Growl For Linux is a linux-compatible notification system of Growl. Growl is a notification system for Mac OS X. It uses GNTP (Growl Notification Transport Protocol) for notification.

Growl For Linux provides four kind of display styles - balloon, fog, libnotify and nico2. The display style is implemented as a plugin, so you can add a new display style if you want.

And more, Growl For Linux supports subscriber which will interact with other software. Currently Growl For Linux supports Rhythmbox.