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.

Notus - Web Notifications Widget  

A non-blocking pop-up notification library for web pages.

dndod popup  

Simple and easy library for creating modal window messages, alerts, and confirm dialogues.