Vanilla JavaScript Plugin

Notifier  

Notifier is a tiny plugin for displaying Growl-like popup messages.

Plugin Website  Demo

Related plugins

SmallPop  

A lightweight widget for displaying popup notifications and informative messages in Growl style.

Snazzy Info Window  

A helper for creating highly customizable and dynamic Google Maps marker info popus.

blinkTitle.js  

Create notifications in the browser window's title bar. Change the title bar content or make it blink if desired.