Growl On Your Phone
Although Growl comes standard with several different displays, it also supports adding custom displays. Displays don't have to be just visual though - custom displays can forward notifications to an email address or SMS, post to your Twitter account, launch another program, or even read your notifications out loud to you.
Inspired by the typography-heavy UI design of Zune and Windows Phone.
Displays notifications in an iPhone-like alert.
A display customized for Twitter apps.
Displays a progress-bar-like indicator.
Uses cartoon speech bubbles to display notifications.
Posts notifications on familiar yellow sticky notes.
Displays notifications with a soothing blue hue.
Displays notifications in a compact, dark-colored alert in the corner of the screen.
Uses text-to-speech to read notification aloud.
Displays notifications in one translucent dark container.
A smaller, more compact version of Visor.
Similar to Visor, but notifications rise up from the bottom of the screen.
Displays notifications with a clean Mac-like appearance.
Displays notifications in any corner of the screen with an eye-catching graphic.
Displays iTunes album art and allows you to rate the currently playing track.
Runs a script or launches a program in response to a notification.