The ILGeoNames wrapper, supported by Infinite Loop, allows users to access the GeoNames API using Objective-C. The library's classes provide an alternative to the MKReverseGeocoder class from the iOS SDK. ILGeoNames is available under standard BSD license terms.
Realm, a mobile-first application development startup, recently announced the release of a new service tier. The Professional Edition aims to bridge the gap between the free developer-edition and the enterprise edition which had been previously offered.
Foursquare just made the switch from using the Google Maps API, to joining the crowd-sourced, global OpenStreetMap movement. To do most of the heavy lifting, foursquare relied upon the still fairly new MapBox API.