Flexible UI Notifications Framework: Backbone.Notifier
Backbone.Notifier is a powerful and flexible framework for displaying and controlling UI notifications.
It is built on top of jQuery, Backbone.js + Underscore.js and has many cool features like a 3D module or animations support.
The notifications can be displayed on the top or in the middle, modal notifications exist and it is possible to set custom styles via CSS + JS API.
Messages can be timed to be shown or hidden as wished, an integrated loader exists and there are pre-defined styles: default, info, error, warning and success.