Reverse Geocoding/MapKit on OSX?

the iPhone SDK provides with MapKit a simple solution for maps und reverse geo开发者_StackOverflow社区coding without any additional costs. Does anyone know if there is a similar Framework for Cocoa on OSX? I know that google maps is capable of that but as far as I know and understand I have to pay while using google maps in a commercial application?

Thanks for your answers

twickl

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You won't have to pay as long as you don't use the quota.
The api documentation is here : http://code.google.com/apis/maps/documentation/geocoding/

If you plan to use it reasonably, this will remain free (no api key is required anymore by google)