The Google Places iOS library by Lukas Kukacka uses a simple block interface to interact with the features of the API that include mapping, localization, and reference. This project offers place search, with nearby search and text search. It also provides places details, with a more detailed information about a specific location. Available as CocoaPods.
CloudMade, a geospatial services provider that utilizes the open source map data from OpenStreetMap (OSM) (our OpenStreetMap API Profile), recently released a new CloudMade Platform that includes access to various mapping tools and APIs for geo developers including Geocoding and Geosearch, Location Management,Map Tiles, Routing, and Vector tiles (alpha). CloudMade says that the combination of the rapidly growing community sourced mapping data of OSM and their new APIs are the future of mapping.