Information Popup in Mac

I am developing an application for Mac OS , i need to display a information popup in Mac, In Windows OS context, it should be similar to the one, which used to be displayed near by tray-icon,

More real example is, assuming any messenger application is running, and someone form your contact list became online/available,then Messenger App display a Animated Popup near by tray-icon area,

the same use-case i 开发者_如何学运维am having , While googling i came to know, either i can make use of NSAlert or Growl , any other application that i should think.

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There is no default alternatives to the Windows popup message on the Mac, but the de facto standard for doing this is through Growl. NSAlert popup messages are usually used to display exactly those: alerts. They are often to large and cumbersome to display small amounts of information well without distracting or interrupting the user. Growl, on the other hand, works well for things like these, and is what you should use.