[fro]

Another alternative to MapKit is MapBox's opensource iOS SDK. They have better support for OpenStreetMap layers and custom maps built with TileMill.

[glennon]

Here's a few links about the open source Mapbox iOS SDK: http://mapbox.com/mobile/

Installation/Guide http://mapbox.com/mapbox-ios-sdk/

Github Repo https://github.com/mapbox/mapbox-ios-sdk